Okay. I'm 13, and having boy problems. Please helppp. X/?

Okay. The guy just moved in right by me. And one of my friends she has a boyfriend but she insits on flirting with the guy that moved in by me. And we already told her boyfriend and she lied and got away with it by saint that she doesn't like him and all this but yet she is posting all these statuses on facebook about him. And it's possing me off. Because I like him. And. Ugh. I know it drama. Just someone please help me. Before I get in a ight with her.