Impetuous1

Uggh. She reminds me of someone I used to know. A real manipulative bitch. She claimed she was a christian but did all sorts of unsavory things behind her boyfriend's back. (Such as sending naked pictures of herself to her male internet friends. Meeting up with one of them and making out. Having online affairs where she was telling other men she was in love with them.) But it wasn't cheating because it's not really having sex right?

Dump her. She's way too much trouble. And if you can't; then talk with her. I could be wrong, but I can almost guarantee that she will agree with you while you talk with her but forget all about your discussion at a time when it's convenient for her. If she does that, then at least you can say you tried. Don't let her walk all over you. I used to let that happen to me. It never leads anywhere good. Girls, and people, like this choose people who will take abuse because they are afraid of any backlash that they would get in a healthy relationship where they would actually have to learn to share and be selfless. They want to have the attention they crave from a S/O and also not have to commit 100% so they can serve their selfish needs. In other words, they're afraid of conflict. I'll take a good straightforward fight anyday rather than dealing with mind games.

I just read my post back and realized it was somewhat rude. I apologize about that. As to your OP, I say make sure you don't get too emotional when you talk to her. Keep a clear reasonable head. Most importantly, provide examples. Then explain how her behavior makes you feel. If she responds with some solution or apology, then maybe she is worth it.