My girlfriends cheating on me! Again!!!

Okay so I found out that my girlfriend is cheating on me again. Last time she did it I forgave her, and this time I don't want to. But she's like so convincing that I had to forgive her again. I love her but all I want is a little bit of honesty. Whenever I ask her about it she refuses to admit she is. And when I catch her that's when she falls on my knee. Now what am I supposed to do. I cannot share this with any of my friends since they would laugh on me and I have a quiet a good reputation in school. Please help if you can. And no rude comments - we have been together for like 5 years and it's hard to let her go. My cousin suggested to get a rebound girlfriend if I need to get over her. I don't exactly understand what he means by that.

Put the internet to work for you. via Personal Recipe 2629979