Understanding a Breakup

Breakups Are Hard: Why Do I Miss My Ex Even Though They Treated Me Bad

You can know, with 100% certainty, that a relationship was chaotic and you needed out. You could see the red flags, the bad behavior, and the fact that you were in a toxic relationship cycle or a trauma bond with someone who gave you non-stop emotional whiplash with consistent inconsistency. You can even be the one to say "I need space" because the logical side of you knows that is what is for the best.

But then contact is finally cut. The digital wall goes up, the phone goes quiet, the silence sets in, and for a moment things feel clear.

And suddenly you’re crawling out of your skin.

You find yourself thinking about them. Missing them. Wanting… desperate even… to reach out… to have some kind of connection with them.

But you know why it ended. You know it wasn’t sustainable.

You feel like you’re losing your mind. You don’t understand why you cant stop thinking about your ex. And you are asking yourself if it is normal to feel crazy after a breakup.

Why are you missing someone who was so bad for your peace of mind? Because you aren’t just going through a break up. This is your nervous system going through withdrawal.

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Why Do I Miss My Ex Even Though They Treated Me Bad?

Heartbreak can feel romantic in a Taylor Swift break up song, but it’s actually a lot closer to a drug withdrawal. When you are with someone, your brain and body get used to a steady supply of the happy chemicals, dopamine and oxytocin. But it goes deeper than just chemicals. We actually co-regulate with our partners.

Our nervous systems lean on each other to find a sense of safety and calm. It’s a biological shorthand we’ve had since we were infants for nervous system regulation; just being in the presence of our person tells our body it’s okay to exhale.

Even in the most chaotic relationships, we have these tiny windows of coregulation. It’s the make-up after the blow-up. It’s the one calm hour after a day of spiraling.

When you finally block each other's contacts, and after all the chaos you finally call it over for good you are lose your external regulator. Your nervous system is suddenly screaming because it’s lost its "safety" signal. This is why you feel like you’re crawling out of your skin; your body is literally panicking because it’s forgotten how to breathe on its own. Breakup feels like withdrawal.

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You Might Want to Check Your Ex’s Social Media (Even though you know you shouldn’t)

That urge to stalk an inactive social media profile? The urge to show up a place where you might run into them? The urge to ask the mutual friend about them?

Do you actually want your ex back? Not exactly. It’s a biological craving. Your body is hunting for a trace of the chemical reward it’s been cut off from.

Your brain doesn't care about the fight you had or the awful behavior; it just wants the chemical hit back. This is why you want to check their socials or "stalk" a profile that isn't even active.

Research on the neurochemistry of heartbreak confirms that this feeling….. it’s a physical state of withdrawal that targets the same part of your brain that registers physical pain. You aren't being dramatic; you’re walking around with a neurological compound fracture.

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Should I Text My Ex? No! : Going No Contact With an Ex.

One of the best ways to heal from a breakup is to take some time to disconnect from your ex partner. Yes, that means, even if you think you want to be friends one day, a period of no contact can be really good for you. It doesn’t have to be harsh or cruel. I am happy to help anyone draft a text message letting their ex know that they are going to blocking and deleting them from social media and other contacts for a period of time.

But as a human with a nervous system, I know that sitting behind that digital wall is a special kind of torture.

Why does going no contact work? The reason why a total disconnect for a period of time is might

be the best thing you can do after a break up because research on neurochemical withdrawal (Roy et al., 2025), has shown every time you check a profile, hear a voice, or receive a text, you are giving your brain a tiny, hit of that chemical supply.

While it doesn't send you back to day one, reconnecting with an ex spikes the craving all over again. It’s like sitting at the bar when you are trying to quit drinking. Your nervous system can’t finish the detox if you keep re-introducing the stimulus.

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Why You Still Miss Your Ex After a Breakup

Even when a breakup is logical, the "attachment bond" in your brain hasn't gotten the memo yet. Your system want to be coregulated. The hardest thing to accept is that logic cannot speed up biology. Attachment bonds (Chong & Fraley, 2025) are stable by design. We don't have an off switch that flips just because a relationship is bad for us. Attachment bonds don't snap; they fade.

Missing your ex isn't a sign you made a mistake; it's a sign your brain is "detoxing" from a bond it’s been wired to rely on. This is why checking their social media feeds just sending a quick text to reach out feels like a survival need.

Knowing the relationship wasn’t sustainable and it wasn’t working doesn't stop your own nervous system from reeling. The goal isn't to stop missing them immediately; it’s to survive the neurochemical withdrawal until the brain settles into its new reality.

Moving On From a Breakup

So, if you are currently staring at a muted phone or fighting the urge to check an Instagram story, take a breath. Remind yourself: This isn’t a lack of willpower; it’s biology. We often judge ourselves for missing people who weren't good for us, but logic is a poor match for an attachment bond. Understanding the why behind your distress doesn't make the pain disappear, but it can turn down the volume on the shame. If you’re in the thick of this withdrawal, be as patient with yourself as you would be with someone recovering from a physical injury. Healing

isn't about flipping a switch; it's about staying the course through the fade. Your logic made the right call… give your biology the time it needs to catch up. You are going to be okay!

Understanding the neurobiology of heartbreak is the first step, but regulating a panicked nervous system often requires support.

At Aligned Minds in Edmonton, our team of therapists specializes in helping individuals navigate the complexities of trauma bonds, relationship transitions, and the physical toll of heartbreak.

Connect with our team to learn more!

References

Cai, S. (2025). Factors influencing post-breakup recovery: A review of relationship dynamics, individual differences, and therapeutic interventions. SHS Web of Conferences, 222, 02023–02023. https://doi.org/10.1051/shsconf/202522202023

Chong, J. Y., & Fraley, R. C. (2025). The Long-Term Stability of Affective Bonds After Romantic Separation: Do Attachments Simply Fade Away? Social Psychological and Personality Science. https://doi.org/10.1177/19485506251323624

Roy, A., Kumar Yada, M., Singh, A., & Kumar Mahto, I. (2005). The neurochemistry of heartbreak: Unravelling the complex interplay of brain regions, emotions and neurotransmitters in relationship breakups. Int. J. Sci. R. Tech, 2(7), 216–224. https://doi.org/10.5281/zenodo.15861168

van, Kidd, M., Scheffler, F., Roos, A., Lesch, E., & S. Seedat. (2025). Factors associated with psychological distress following romantic relationship dissolutions and the role of attachment. Current Psychology. https://doi.org/10.1007/s12144-025-08368-9