I like this guy and we have had history of liking each other for years and stayed just "friends" but we were really more, but then he left me for some other girl and came back and did the same thing. I like him so much and he says he will change and I want to be with him but now we have no classes together and I'm scared he'll go back to his ex even though he says he can't risk losing me. How am I to believe him and not get jealous ? Please help me. Honesty please.