Best Friend Troubles HELP: Part 3

Lauren
Ok you guys. So for those of you who don't know, let me fill you in. My best friend and my best guy friend, who I was recently romantically involved with, kissed twice without my knowledge when they were both aware of how I felt about their whole friendship getting too close. I was not aware that anything like that would happen though. So, naturally, I was furious, and still am. And we've all done some talking and I decided I needed a break from both of them. Now, my guy friend is very sorry and regrets it and hopes I can forgive him and is being very respectful of my wish, whereas my girl friend, who is supposed to be my best friend, is being extremely immature and childish. She's making it seem as if she is the victim here and I don't really have that much of a reason to be as upset as I am. She's acting as if she has a right to be so furious with me and the way I'm "treating" her. When I am trying to handle it calmly and respectfully. She was very rude when I asked for a break, and she's taking to social media to vent out all her frustration, retweeting all this emotional crap about feeling sorry for herself, deleting captions from pictures of us on instagram, deleting comments on MY pictures, and deleting a photo of us altogether. I'm getting very frustrated with her behavior and am actually getting to the point where I would rather forgive my guy friend, who is slightly more at fault than she, than forgive her just because she is handling it so immaturely and disrespectfully. She's making me feel even more like crap than I already do and I truly do not think she fully understands the gravity of the situation and how she made me feel. She's not taking my feelings into consideration at all. Please someone help. I'm going insane with anger and sadness and I don't know what to do.