Im gay, but my boyfriend is "straight" he has been doing me wrong lately, how do i keep him? i love him..?

He claims to love me, we have been together for 13 months, but he cheats on my with girls, we dont have , kiss, or anything (but its not about that) he barely talks to me, and we hardly ever are together.. Im not really sure what i should do, i mean thats my baby and i love him with all my heart, but he pushes me away alot and i dont really know why. i figure that if he didnt really love me, then he wouldnt still be there, but if he really did love me, then he would show me more attention and love, IDK we are young.. im 17, he is 15 =( that is a whole nother problem lol..