Hi there, a week ago I went to a this guys house , Adam, and a few of us took some shots and me and Adam ended up hooking up the whole night. He had a girlfriend at the time but they only had been dating for two weeks. I liked him before they started dating and I still did. He is not going to yell her or even break up with her after cheating on her. He said he likes me and I know I like him but I don't know what to do. Any advice?

Sure. Stop these casual encounters if you are going to fall for people; most of them end like this.
He's not going to break up with her! How do I know? You said he told you so.
Sorry to sound tough but you need to accept this.

He wants his cake and he wants to eat it, why should he finish with her when he can have both of you, he's using you, don't let him, and don't ever hook up with someone that's taken, its girls like you that a lot of women hate (men are just as much to blame), home wreckers as some call it, and I'm not saying you are one now as your young but don't turn this into a habit and grow up to be this way... you will get into a hell of a lot of trouble...

I agree, sorry to sounds harsh but he palying games with you & just trying to have two girls, or have you there in case she breaks up with him.

So you like this boy... but he's a cheater, but you like him.

So when you two get together... and he cheats on you, and doesn't tell you... then what?

And I know, you're thinking, "He'd NEVER do that to me."

... yeah, he will.