Rem45 said:
She told me specifically that she can't be his friend because she would date him if I wasn't her boyfriend and that she wanted the kiss.
Methinks you are overreacting. And I will prove it with a story.
So I'm friends with a girl whom I love. She told me that if she didn't have a boyfriend then she would totally be with me all the way. One time we all spent a night at a hotel. I'm not sure how it got to this but I asked and her boyfriend said it was ok for me to cuddle with her while he was in the shower. We weren't naked or anything, although we were in our underwear. Regardless she said there was no way that she would ever cheat on him no matter how much she liked me. Not only that, but the fact that her boyfriend trusted her with me made her love him all the more. They really seem happy together, and that makes me happy.
Point is, she was honest with you about the kiss, getting pissed off about it will give her even more reason to cheat on you.