What? You want to break up with her because she's too attractive? Geez.....that would make me feel terrible if my man told me that! It would make me feel like my other qualities weren't worth a hoot! So other men hit on her, so what.....here's another way to look at it, when guys are looking at her, stand tall, puff your chest out, and be proud, other men are looking at what's yours and they can't have it! Please don't tell her you feel like she's cheating on you if she's not....I know how that feels, it'll make her feel angry and terrible about herself even though she didn't do anything. Good luck!