What should I do with the guy?

Ello's. I'm Emma. I been seeing this guy and I'm crazy for him... We have been fighting for awhile. I meet him during the summer and he doesn't live down here. I'm 12 and he's 16. We have been dating since August 15 to December 20. And he love's me I know that because I can tell by the way he acts and say's it. He's just sexual and we always fight because of that. And he done stuff behind my back with another girl. (that made me mad) I forgave him for that. I just don't know what to do. I love him and he loves me. But the things he does its just hurtful. He's selfish sometimes and real mean when I don't do something for him and the he will start saying sorry that he was being stupid. What do you think I should do? Move on?