The way I see it, he's either trying to win you back or just looking if you still had it bad for him. Okay, forget about winning you back.
There's a reason why you guys broke up. Chances are, he's most probably lonely that time and felt the need to hit you up. Once he get the idea that you are still emotionally inclined that way, he'll run you off.
Play it cool. Guard your heart. There's no harm in talking, maybe he needs someone relatively close, just friends maybe. But it doens't mean he's not holding back either.
Hey, I already added you on ym.