Sage

If her cheating really bothers you (and you say it does) even if you get together, and even if she NEVER cheats on you again (which I'd say she would- she sounds like a TOTAL flake) you will have to go through, every day, wondering if she will. Every single day when you look at her, or kiss her, or have sex with her you will be wondering if she's thinking about someone else, or if she thinks someone else is better than you are. That's a lot of strain to put on a relationship, doubly so since you're so young. You say you love this girl- if you really love her, you can let her go knowing that if she really is the one you want to be with, you two will be together no matter what. She sounds like she's young and wants attention and has absloutely no idea what the term "monogamous" means. Go have some fun, go find a girl who will respect you (because M sure as hell isn't respecting you), and enjoy being young. Life is too short to be in a less-than-perfect relationship.

__________________