So i love him...but..please helpp?

Okay, so I'm abolutely in love with this kid. He likes me back, but were both in a relationship. His is happy, mine, not so much. My boyfriends a jerk and the other guy constantly tells me that I deserve better. I don't think I do, but thats beside the point. He's been with his girl for seven months, and he would never break up with her. We were going to date but he decided to give her a chance. She's not the best person, and she's really not good for him but he's the only person that doesn't see it that way. My boyfriend called me a skank, and I started crying and the other guy kept telling me that I wasn't and when I told him I everytime I fall in love something goes terribly wrong or it just stops. He said not everytime. Then he told me I deserved to be happy, but I'd have to wait. I don't want him to dump his girlfriend, but I would give everything I've got just to be with him again, because no one else in the world has ever made me feel this way. So what exactly should I do?