Why did he talk to me?

[Hannah]

Likely he wanted to test the waters- wanted to know where you stood with him. Some like to know you have no qualms even if they still do. And some are just curious to know how much you still care for them, they can feed off of that.

Just avoid trying to make lengthy conversations, be the one to say "I gotta go, thanks" if you do get caught in a convo. Stay kind but distant; don't get drug back into an emotional whirlwind. If he feels like he can be a friend to you still he will make the move to show it- and suddenly dropping conversations is NOT the way to show it.
Push past these troubles and focus on yourself and yourself alone.

Best of luck to you.