<human>: Condense the text into a few key points

We had a 3 some last night. It was both of there's first time with a girl, and they are best friends.. During the 3 some when I was kissing my girlfriend, Andover fingering her friend, my girlfriend sat up really quick and started panicking and getting really mad at me saying "how could you!" even tho I asked if it was okay over 5 times..and her friend did too, She says she feels betrayed and she realizes she said it was okay but I should have known better and not gone with it.. So she started yelling she hated me and we broke up last night because she feels "Betrayed" And shes trying to pain this as my fault and is making me feel like I am absolute shit.. Am I?  Her friend is even saying that its not my fault but that doesn't do me any good because she is being so hard headed.. What do I do reddit?? I don't want to lose her.. 

How do i try to fix things with her??
<bot>: Girlfriend broke up with me during a 3some with me, her and her best friend, is making me feel like complete shit, don't know what to do.