HELP??? 10 PTS BEST ANSWER???? Is he just trying to make me jealous?

I broke up with this guy for genuine reasons b/c of lots of work that was bogging me down, and he didn't mind. But then he saw me hanging around another guy and thought I was flirting. He was so mad. He then started dating another girl but would sometimes stare at me while talking to her. And if he had just finished talking to her but then saw me he would try to extend the conversation with her so I could see them. But if he's alone he avoids eye contact with me or acts resentful. And once when he saw me talking to another guy, he had this angry look.