Please help, Long,boyfriend problem Options

[sukixinaxmou]

I met this guy at the mall January 6th.We started going out the 8th.He makes me really happy,but then again,he makes me really annoyed and angry and sad and frustrated.Hes really emo,too.He said before he met me he was on the edge of killing himself.Hes making all of these plans to marry me when I'm old enough.By the way,I'm 13,hes 15.Anywho,he's okay that I'm bi,and all.And I really don't know what to do.Everyone call me a whore because I'm always in a new relationship.But that's been happening since last year when my boyfriend died,and then my other boyfriend died,and then my best friend died.I'm so confused.Because if I leave him I'll tell myself that I want to be single for a while,but then like 3 days later I'm in another relationship with another guy I don't really like.Plus,my bf seems like a cheater,because when we met he had a gf and he kept flirting with me,god only knows if he is doing the same thing to me.I don't know what to do.If I leave him,what if I really don't get another guy for a while,I don't want to be alone,and I don't want people thinking I'm a whore or anything.And then again,what if he isn't kidding.He says if we ever break up he'll kill himself?I wouldn't be able to live with that.Anybody know what I should do?