Short answer: Seeing your ex with someone new, in person or online, can feel like a punch to the stomach because your body treats it as a real threat. In the moment, get some distance, slow your breathing and don’t react. Afterwards, name what you’re feeling, stop yourself from replaying or researching, and remember that a glimpse of their new life tells you very little about it, or about you.
Maybe it was a story at midnight: their hand on someone’s knee, a restaurant you used to go to. Maybe it was real life: across the bar, at a friend’s birthday, in the queue at the supermarket. Either way, your heart is pounding, your face is hot and your mind is already running a hundred questions. Here’s what to do in the next hour, and in the weeks after.
Why it hits your body so hard
That sick, shaky feeling isn’t in your head. Kross et al. (2011, PNAS) found that when people who’d been through an unwanted breakup looked at a photo of their ex, brain regions involved in physical pain became active. Seeing them with a new partner adds jealousy and a sense of social threat on top. Your body releases stress hormones, your heart rate climbs, and your mind goes into overdrive. Our guide on why breakups hurt physically explains more.
So if you feel like you might cry, shake or need to leave, that’s a normal stress response. It will pass faster than it feels like it will.
If you see them in person: what to do in the moment
1. Get some distance, calmly
You don’t owe anyone a performance. Go to the bathroom, step outside, move to another room, or leave if you need to. “I’m just going to get some air” is a full sentence.
2. Breathe out longer than you breathe in
Try breathing in for four counts and out for six, for a minute or two. A longer exhale is a simple way to help your body settle. Most intense surges of emotion peak and start to fade within minutes. Our guide to the 90-second rule explains how to ride the wave.
3. If you have to say hello
Sometimes there’s no escape: a small party, a shared friend group, a workplace. Keep it short, polite and neutral:
- “Hey, good to see you. Enjoy your night.”
- “Hi. Hope you’re well.”
- To the new partner, if introduced: “Nice to meet you.” Then turn back to your friends.
You don’t need to be friendly beyond that, and you don’t need to prove you’re fine.
4. Don’t do these tonight
- Don’t drink more to numb it. Alcohol makes the 1am text far more likely. If that’s a pattern, read our guide on drunk texting your ex.
- Don’t confront either of them.
- Don’t stage a “look how happy I am” moment.
- Don’t text them afterwards. Not “it was weird seeing you,” not “she seems nice.”
If you see them online: what to do right now
Online sightings often hurt more, because you can replay them. The photo is right there, zoomable.
- Close the app. Not after one more look. Now.
- Don’t screenshot it or send it to friends. It feels like processing, but it keeps the image alive.
- Mute both of them. Your ex and the new partner, on every platform. Mute any mutual friends who are likely to post them for a while.
- Don’t go researching. The new partner’s profile, their tagged photos, their ex. Marshall (2012, Cyberpsychology, Behavior, and Social Networking) found that more online monitoring of an ex was linked to more distress and longing, and less personal growth.
- Put the phone in another room for 20 minutes. Do anything physical.
Just saw the photo and want to text them? Open the SOS button in Breakup AI before you type anything. It walks you through the next few minutes and counts your no-contact days.
After it happens: the next few days
Name the exact feeling
“I feel awful” is hard to work with. “I feel replaced,” “I feel humiliated,” “I’m jealous,” “I’m relieved it’s not me” are easier. Research by Lieberman and colleagues (2007, Psychological Science) found that putting feelings into words, which they called affect labelling, was linked to reduced activity in the amygdala, a brain area involved in emotional reactions. Say it out loud or write it down.
Catch the replay
Your brain will loop the scene: their laugh, the way the new person leaned in. When it starts, notice it (“I’m replaying it again”) and redirect to something specific: what you’re cooking, the next song, a message to a friend. You’re not trying to never think about it. You’re just not feeding it.
Watch out for the stories you tell yourself
| The story | A truer version |
|---|---|
| “They look so much happier than they did with me.” | I saw a moment. Everyone looks happy in a moment. |
| “The new person is everything I’m not.” | I know nothing about them except what they look like. |
| “I’ll never get over this.” | I’m forecasting from the worst hour I’ve had this month. |
| “It means I was the problem.” | It means they’re with someone else. That’s all it means. |
That third row matters. Eastwick et al. (2008, Journal of Experimental Social Psychology) found that people going through breakups overestimated how upset they’d be and for how long. Tonight’s feeling is real, but it isn’t a forecast.
Protect your sleep
A sighting late at night can wreck your sleep, and a bad night makes everything worse. No screens in bed, phone across the room, and if your mind won’t stop, get up and do something boring in low light until you’re sleepy. Our guide for when you can’t sleep after a breakup has more.
Try this tonight:
- Mute your ex and their new partner everywhere. Two minutes.
- Write one sentence: “Right now I feel ___ because ___.” Fill it in three times.
- Text a friend: “I saw my ex with someone new and I’m wobbly. Can you send me something funny?”
- Breathe in for four, out for six, ten times.
- Phone out of the bedroom.
If you’re going to keep seeing them
Same gym, same office, same friend group. Repeated sightings need a plan, not willpower.
- Change what you can. A different class time, a different coffee shop, a different route for a while. It’s not running away. It’s giving yourself room to heal.
- Prepare a script. One neutral line you’ll say every time: “Hey, hope you’re well.” Practice it so it comes out automatically.
- Bring a buffer. At shared events, stay near a friend who knows the situation and can step in.
- Plan a decompress. After a work meeting or party where they’ll be, have something calming lined up: a walk, a call, a bath.
- Talk to mutual friends. “I’d rather not hear updates about them for now” is a reasonable request.
Is it normal to still care after weeks or months?
Yes. Seeing an ex with someone new can sting long after you thought you were over them, especially the first time. It doesn’t mean you’re back at square one. Often, the second and third sightings hurt much less than the first. If it’s been a while and they moved on very quickly, our guide to when your ex moves on immediately covers what that usually means.
If it’s affecting your sleep, work or eating for weeks, or you can’t stop checking their profile, talking to a therapist can help. If you ever feel unsafe, call or text 988 in the US, or call Samaritans on 116 123 in the UK.
FAQ
Why does seeing my ex with someone new hurt so much?
Rejection activates brain regions that overlap with physical pain, and seeing your ex with someone else adds jealousy and a sense of social threat. The racing heart, nausea and shakiness are a normal stress response, and they pass.
What should I do if I see my ex with someone new in person?
Give yourself distance, breathe slowly with longer exhales, and keep any interaction short and neutral, such as “Hi, hope you’re well.” Avoid drinking more, confronting them or texting afterwards.
Should I look at my ex’s new partner’s profile?
It is better not to. Researching the new partner usually feeds comparison and replaying. Studies of online monitoring of exes link it to more distress and longing. Mute both of them instead.
Does it get easier to see my ex with someone else?
Usually yes. The first sighting is often the hardest, and later ones tend to hurt less, especially if you have a plan and avoid checking on them online in between.
How do I stop replaying the image of my ex with someone new?
Notice when the replay starts, name it, and redirect your attention to something specific. Writing down the exact feeling, muting them online and protecting your sleep all help the image lose its grip over time.
