Why is he doing this?

My ex and i were in a relationship but we broke up because "lack of understanding" in our relationship. he loved me so much, but our relationship wasn't working out so we were just friends. now we're so close we know everything about each other and stuff I've caught feelings for him and maybe he did too, I don't know. he's sending a lot of mixed signals but don't want to commit. he gets jealous and also try to make Me jealous. I'm not sure what he wants, everytime i want to talk about it he just skips or ignore me.
Why is he doing this?
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