Boyfriend!! grr need help i dont know what to do!!?

As a guy, I can honestly tell you that if he hasn't cheated yet, he's definitely going to :/. I mean if he's doing all this stuff behind your back with a girl that is slutty, it's only a matter of time. My advice to u is to just dump him ASAP. That won't stop him from fooling around with this girl but he will definitely realize that he really f**ked up with you and will regret the hell out of it. He really doesn't deserve you and i hope you realize that.