<human>: Can you condense the text into a few key points?

Hello reddit, hopefully this won't be too difficult to suss out, but I would prefer to hear some outside advice before doing anything.

Long story short, I dated this girl a few years ago, we broke up because she moved away, but for the next year and a half or so, we acted like we were still dating and only cut contact when she became pregnant. Should be over, right?

Well sadly it's not, about 3 months ago, at the behest of a trusted friend, I contacted her to apologize and to make sure anything that was said between us was just our highschool selves speaking.  It sounds childish and selfish, I know, but I was having nightmares about some of the words we exchanged at the end and it was eating me up inside to the point where I was feeling ill (I struggle with depression and PTSD).

Anyway when we were talking she made an offhand comment about suffering physical abuse at the hand of an ex, and that she didn't think there would be any guys in her life after that. After we finished the conversation, neither of us have spoken since.

But when she said she had been abused, that stirred something up inside of me and I have been (maybe unnecessarily) worrying about her again for the first time in a few years. I have this urge to reach out, just to make sure she's doing alright. My question to you all is, is this just a little leftover bit of what we had years ago that's trying to resurface? Part of me thinks that's what it is, but the other part says that no matter if it was an ex or just a female friend I would be doing the same thing. Also, should I? I am afraid I would be overstepping a boundary, and if I don't message her, it isn't the end of the world. If I am just being an idiot, feel free to tear me a new one.
<bot>: Ex told me she suffered abuse in the past, I feel the need to make sure she's still doing alright, is this overstepping my boundaries?