Dump her nudes and move on. Try to get with her best friend. Can't get with best friend? Just find a girl that's an upgrade. Low Self Esteem? Work on it bro. It's hard but you can work on it. The best thing to do is stop giving a fuck what others think. Not being an asshole but doing what makes you happy. If you're paranoid about a girl cheating on you, simply don't give a fuck unless she gave you reason to cheat. Confront her calmly not like a bitch and if more reasons pop up, she's not for you /b/ro. Don't waste your time in meaningless relationships.