Why is he coming back to me?

In a previous question, I talked about my crush rejecting me because of a toxic relationship he left about 10 months ago. I mean the works, emotionally & physically abusive.

Now, up to that point I had to start every conversation with him. Always asking him how he's doing etc. Since he rejected me, he has hunted me down TWICE. Talking to me, asking how my parents are, how I'm doing, how work is. I'm like... what? And he doesn't care where it is, at lunch at the shuttle in the breakroom. Does not care.

what's happening?
Why is he coming back to me?
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