My Ex Slept With Someone Else While We Were Broken Up

Updated on September 16, 2025

If you learned that your ex slept with someone else while you were broken up, you likely feel hurt and betrayed. You feel like your ex acted impulsively and selfishly and completely forgot about you and all the promises he or she had made during the relationship (prior to the breakup).

It probably feels like months of getting to know each other, bonding, and planning went down the drain, and that your ex stopped valuing you and seeing a future with you.

Although your ex probably tried to move on quickly and didn’t care much (or at all) about your expectations and feelings, try not to let your insecurities play with your thoughts and feelings. First, take a few deep breaths and try to understand that you were broken up and were allowed to date other people.

You may not have expected your ex to jump ship so quickly, but that’s what a breakup (disconnection) does and permits. It makes exes crave understanding and validation from others and allows them to focus on themselves.

Their actions show that they’re living for themselves and that they’re focused on the present and future, rather than the past.

Whether the breakup was amicable or unilateral, your agreement to be exclusive expired the moment the breakup happened. That means you had the right to stay single, date other people, or even sleep with them. Your ex didn’t break any promises unless he or she promised not to sleep with anyone and merely did what felt right in the moment.

That probably doesn’t make you feel better, but think of it this way. If you were your ex and received an opportunity to sleep with another person, would you have taken it? Or would you have kept crying over your ex and mourning the loss of the relationship?

Something tells me you would have chosen to move on and tried your luck with someone new and different. This is especially likely to be the case if you left your ex and blamed him or her for the breakup. Most dumpers don’t need any time to start dating again. They’re emotionally detached and can start a new romantic or sexual relationship right away.

Does that mean they can hurt their dumpee ex?

Absolutely not. The dumpee is attached and has feelings and doesn’t want to see the dumper with someone else. Seeing the dumper bond or sleep with another person kills the dumpee’s hope for reconciliation and makes him or her feel unattractive and worthless.

It’s normal for the dumpee to feel insecure after the breakup. It’s also normal for him or her to feel hurt after getting back together and finding out his or her ex had slept with someone else during the breakup. The dumper is someone he or she never stopped valuing and loving, so it hurts immensely knowing that he or she had been intimate with someone else.

Dumpers typically have an easier time processing the news of their ex sleeping with someone else while they were broken up. They dislike it, but they accept it quicker than dumpees because it was their idea to break up. They knew the consequences of breaking up, but decided to leave anyway.

Basically, they remained in control and never took a hit to their self-esteem, so they recover much quicker. This doesn’t mean they never suffer, though. If the breakup was short or was just a fakeup, they can get immensely hurt, especially if they didn’t date or sleep with anyone while they were gone.

Therefore, both dumpees and dumpers sometimes sleep with someone else shortly after the breakup. Dumpees do it to feel desired and secure, whereas dumpers wish to feel validated and distracted. They want to move on from the past and get the most out of their life.

I don’t know if your ex was a dumpee or a dumper, but if you left your ex, your ex was broken-hearted and thought that someone else might have filled the void you created. In other words, your ex tried to numb the pain by getting involved with someone new.

Many dumpees do that, but, unfortunately, most of them fail to feel any better. Instead of getting over their ex, they rebound with the new person and suffer more because of it. A new romantic interest can’t give them the reassurance they want because they crave it from their ex.

If your ex was the dumper, however, then your ex probably ventured out into the dating world to explore other options. Your ex wanted to connect with someone else and start some kind of relationship with that person.

Despite wanting to move on and be happy, things didn’t go according to plan. Your ex soon realized that the person he or she slept with wasn’t you and/or a good match.

The new man or woman made your ex engage in reflection, compare you to him/her, and learn that you were better in many ways. That’s why your ex eventually came running back to you and tried to make things work.

So as difficult as this breakup and the things that happened after it have been for you, try to see the silver lining in your situation and remind yourself that your ex could have cheated on you while you were still together. Your ex could also have stayed with the new person, got married, or had kids, never seeing your value and coming back to invest.

It could have turned out much worse.

So don’t think it’s the end of the world just because your ex acted on his or her urges and slept with someone else after the breakup. I know it’s a lot to process, but your ex didn’t betray your trust. Not by sleeping with another person. Your ex betrayed it by leaving (if your ex was the dumper) and forcing you to fend for yourself.

Rebuilding trust and love will take time.

But before you focus on reconnecting and learning to work together as a team, I suggest that you first talk about the person your ex slept with and see if he or she is still around. The last thing you want is for this person to be your ex’s friend and still interact with your ex. That would make it hard for you to lower your guard and invest your heart in your ex.

Provided that your ex wants to be with you and has the skills to maintain romantic relationships, he or she will be happy to answer your questions and calm your mind. Regretful exes do that out of concern for their ex and their relationship.

Your ex will be transparent and tell you everything you want to know.

Just don’t make things harder on yourself by asking things like:

• Was he/she better than me in bed?
• How did you do it?
• Did you enjoy it?

Some questions are better left unanswered.

I suggest that you ask questions like:

• Why do you think you needed to sleep with someone else so quickly?
• Where did you meet this person?
• Do you still talk to him/her?
• Do you have any feelings for him/her?
• What would you do differently if you could go back in time?

These questions will help you understand your ex’s motives for sleeping with another person and ease your insecurities and fears. They won’t heal you completely right away, but they will pave the foundation for trust to be rebuilt.

In this post, we’ll talk about what to do if your ex slept with someone else while you were broken up.

My ex slept with someone else while we were broken up

Theoretically, it’s not your business what your ex did and who your ex slept with. You weren’t together, so your ex used the opportunity to get close to someone else and slept with that person. Your ex did that for his or her own reasons, whatever those reasons may be.

You probably wouldn’t be able to stop your ex even if you knew what he or she was up to. Your ex decided to sleep with someone else, so your ex was going to do it regardless of what you did or didn’t do. It made sense to your ex to pursue happiness without you and with someone else.

The problem is that you were likely still attached to your ex and had certain expectations of him or her. You thought your ex would handle the breakup maturely (by reflecting and growing), but instead, your ex put himself or herself back out there and slept with someone he or she probably met recently. Your ex gave someone else a chance and, by doing so, hurt you immensely.

The thought of your ex being intimate with someone else now gives you a lot of anxiety. So much so that you compare yourself to the new person and feel replaced and scared.

No one should have to go through the experience of knowing that the person they love had sex with someone else. It’s truly one of the most painful things a human being can experience. The pain can be more severe than losing a family member or a romantic partner. It can be so bad that it causes panic attacks and takes people’s ability to eat and sleep away.

Always remember that if someone has romantic feelings for you, you have a moral obligation not to get involved with other people.

You have to first help your ex (or the person who has a crush on you) and make sure he or she can handle the rejection/separation anxiety before you start getting close to others. That’s the mature thing to do, whereas dating other people right after the breakup is uncaring and selfish.

So if your ex slept with someone else while you were broken up, know that your ex didn’t consider the possibility that his or her actions might hurt you. Your ex was too absorbed in his/her own thoughts and feelings to worry about how you would feel once you found out about the new person.

The unfortunate truth is that many, if not most, people don’t care much about their ex-partner after the breakup. They become angry, cold, or resentful and think that their moral responsibilities end the second they break up with their partner.

They think they don’t owe their ex anything, not even sympathy, when in reality, their ex deserves to be treated with utmost respect for staying committed until the very end.

So if your ex says something like, “It doesn’t matter what I did, we were broken up,” know that your ex doesn’t consider him/herself responsible for hurting you and doesn’t have sympathy for you. He or she doesn’t understand how you’re feeling and will likely tell you to accept it.

My advice is to cut your ex off and forget about your ex if he or she says things like:

• stop making me feel guilty
• stop talking about it already
• get over it
• take it like a man
• What I did after the breakup is none of your concern
• you forced me to do it

The problem isn’t necessarily with what your ex did after the breakup. Sure, sleeping with another person is hurtful, but what hurts even more is the bad attitude toward the whole situation. When your ex refuses to acknowledge your pain and do something to ease it, your ex fails to see things from your perspective and won’t be of any help to you.

Because of that, it might be wise to let your ex go and take some time to get over your ex. You deserve someone who cares about your feelings and avoids taking everything personally.

Talk to your ex only if your ex appears to be regretful and open to talking about the past. Make sure your ex cares about you, answers your questions, and eases your worries, otherwise, you could lack answers and become resentful.

Having said that, here’s why your ex slept with someone else while you were broken up.

What do I do if my ex slept with someone else while we were broken up?

If your ex slept with someone else while you were broken up, the very first thing you should do is tell your ex (or your partner) to get himself or herself checked for STDs and STIs. You don’t want your boyfriend or girlfriend to harm your health.

You want your partner to take this matter seriously and do whatever it takes to make it safe for you and him/her to reconnect and become intimate again when the time is right. I say “when the time is right” because you shouldn’t rush back and follow the same old pattern the moment your ex wants you back.

Rushing may feel right, but it won’t fix the reasons you broke up. It also won’t repair the trust issues caused by the breakup and by sleeping with someone else.

You should first figure out if you’ve improved your shortcomings and ensured that you won’t break up again for the same or similar reasons. Self-improvement is essential if the relationship is going to succeed the second time around.

Secondly, you should talk to your partner about the sexual activity he or she had with the other person. Don’t talk about the act itself, but rather about the reasons your partner was intimate.

Your partner should be honest and tell you he or she felt the drive to do it.

Relationships are built on honesty, so this is a great opportunity to see if your partner will tell you the truth or avoid it out of fear and self-protection. It may not be easy for your partner to talk about this, but not all things in life are meant to be easy. Some things are hard (especially when guilt is present).

Thirdly, you can’t change the past, so there’s no point in holding grudges and calling your partner names. Doing so will only complicate things and make it harder for the two of you to understand each other and rebuild trust and love.

If you’re serious about being with your partner, you’ll have to let go of the past. You don’t have to forget the things your partner did in your absence after the breakup, but do try to see that your partner is with you now and is trying to make things work.

If he or she didn’t feel anything about you, he or she wouldn’t have come back. So don’t make things worse by demanding constant apologies and explanations.

Asking for reassurance is okay, but do that in a kind and respectful way. In a way that shows you’re struggling emotionally but not trying to accuse or put anyone down.

Just as your partner needs to be understanding, you need to be respectful and accepting. You must show that you’re working on accepting your partner’s intimate act or acts and moving on.

If you can’t accept, forgive, trust, and be willing to be vulnerable, you won’t get back together or stay together for long. So decide if it’s worth the effort and you’re prepared to live with your ex’s decisions and actions. If you’re not willing to work on it alone, with your partner, or with a therapist, it may be best to end things right now.

No point in dragging things out when you lose trust in your partner and shut your emotions off.

Exes who get back together out of familiarity or guilt alone sooner or later break up again. They learn they have unprocessed pain and that they’re not willing to stay in an unhappy relationship. That’s why they initiate another breakup and seek people they can start fresh with.

It will take time to heal

Your ex may not have cheated on you, but that doesn’t make things a whole lot easier. Your ex still slept with someone else and showed you how easily replaceable you were, and how emotion-driven he or she was.

If you were dumped, you still had hope for the relationship and thought you might get back together after a while.

But instead, your ex got involved with someone else and crushed your relationship expectations. Your relationship lost its innocence and became heavily damaged.

That’s probably why his/her sleeping with someone else bothers you so much. It tells you that your ex didn’t care about you as much as you cared about him or her, and that your ex only looked after himself or herself.

Your ex’s lack of consideration now gives you anxiety and makes you question your ex’s ability to make you happy.

You especially feel hurt if your ex broke up with you by saying:

• it’s just a break
• let’s give it some time and see how we feel
• I don’t know what I want
• I still love you
• I need to find myself
• I won’t date anyone

Some dumpers use breakup excuses and various distraction techniques to soften the blow of the breakup. They’re scared of being honest because they know there’s a chance their ex won’t like it and might respond strongly. Hence, they choose to lie and deceive their ex.

If that’s what happened to you, you have every right to feel hurt and deceived. Your ex wasn’t honest and returned only because things didn’t work out with the other person.

If you want to make the relationship work, you have to rebuild it from the ground up. Start by growing trust and forgiveness—and then focus on bonding and staying strong.

If you both want the relationship equally, you’ll learn to work together by supporting each other emotionally, communicating healthily, and getting past the sexual experiences you had with other people.

Many people have overcome it, and you can too if you truly want to. But to succeed, you’ll need to avoid acting on anger and fear and give yourself time to heal. If you do this right, you’ll one day realize that the past doesn’t bother you anymore and that you’ve gotten over it.

Did your ex sleep with someone else while you were broken up? Did it make you feel anxious and unimportant? Let us know how you feel and what you’ll do in the comments below.

And if you’d like to talk to a breakup expert 1 on 1, check out our coaching options here.

Zan

My name is Zan and I’m the founder of Magnet of Success. I enjoy writing realistic relationship and breakup articles and helping readers heal and grow. With more than 5 years of experience in the self-improvement, relationship, and breakup sphere, my goal is to provide advice that fosters positivity and success and avoids preventable mistakes and pain. Buy me a coffee, learn more about me, or get in touch today.