<human>: Does anyone else have this problem?
I'm over him, as far as I know, the rest of the time. It's been over a year since we "broke up" (I put that in quotations because it was a long breakup that really ended when we last spoke.) We haven't spoken since June. He was incredibly abusive, I don't even need to get into it, it was ridiculous and pretty bad and hard to get out of it (as you can tell by how long we stayed in contact.) We were together, albeit on and off, but mostly on, for two years. Since our original breakup I've casually dated, with each fling being rather brief...was not looking for anything serious. Lately, I've been feeling ready to commit to something more substantial, and I've found that I've been able to actually like people, rather than just find them attractive, in recent months. In other words, I'm able to feel that spark again, and it's really nice.
However, I find that whenever I feel an actual connection happening (it happened once before, in September, then I decided I didn't want to pursue anything with that person. It's happening again now) I end up thinking about my ex a lot. Not sure why. I've had a number of exes before him, and this hasnt ever really been a thing. I suppose he was my most serious partner (we lived together) but it was equally horrific in how abusive it got. Has this happened to anyone? Any words of advice? Any reasoning as to why this happens? I feel over him, but he's suddenly in my head...why?

Can you provide a brief rundown of the text in within 3 sentences?
<bot>: Title says it. Has this happened to anyone? Any words of advice? Any reasoning as to why this happens? I feel over him, but he's suddenly in my head...why?