Who knows? There's no way of knowing exactly why he was looking at you. Are you wanting to get back together or just casual sex? No matter how you answer to this question, it could be painful for one of you (or both.) You broke up for a reason right? If you're just wanting sex, it could really hurt him badly if he's wanting more. And if you want back together, you could get hurt when he accepts your fuck date but rejects you for a date. Sticky sticky sticky!