I need to leave him. Need a buddy.

I know he isn't any good for me. I'm graduating this May and all he wants to do is what he wants. It's never up to the both of us. He also slept with another girl "too many times to remember" when he needed a "break." He says he's now addicted to sex. Well we are temporarily 3 hours apart until May. He says he can't keep it in his pants that long. He was hitting on a new girl while stringing me along. We have two angel babies and a 5 year old. I need to just leave and forget him but it's hard. The 5 year old doesn't really talk about him much do I'm not too concerned about her missing him too much. I just need a buddy to talk to...