Either way, if she did cheat, that doesn't mean the boyfriend should go out and cheat on her with her best friend. That means the boyfriend should talk to her about it, break up with her, and then move on. Why the hell is our society so damn vindictive? She (or he) did you wrong, be the bigger person and move the hell on.

Just cause a person slipped up does not mean they deserve the same treatment. My husband cheated on me with a very close friend but I understood where they were both coming from and also understand that if I were to cheat, it would hurt me and lower my self respect not to mention hurt the person I love because of an oops moment. People that think cheating is okay cause the other person did it are just as bad as the original cheater, they just found their reason to justify it.

66- This is a 'worst-case-scenario'. Let's just say that OP had cheated on her boyfriend before.. They are/were still together. That means that they, obviously, worked through it. He found forgiveness in OP and they both moved on and let the past be the past. Ok, so he cheats now.. With OPs best friend.. They've moved past the previous issue, found forgiveness, and moved on! So what would make it alright for him to cheat? (Especially, with her best friend!) Moral of the story; two wrongs do NOT make a right! OP has every right to feel the way she's feeling! And, whether or not OP has previously cheated, he is still down-right WRONG for doing this to OP! FYL, OP! Move on, honey! There's more to life than this pain and sorrow! Keep your chin up and move forward! Stay mature about things and, remember, you're better off without them! :)