HELP???? 10 PTS BEST ANSWER???? Does he still like me?

I dumped my bf b/c I was too busy with work. He understood and was a little sad but when he saw me talking to some other guy he got all upset. Then he started dating this other chick, and although he seemed to hang around her when another guy was talking to her he was staring at me. At prom, he gave me no eye contact when he was by himself but when he was with her he turned to stare at me. But half of the time he gives me resentful looks and the other half he tries to get my attention.