Whats the most fucked up thing you have seen a friend do to somebody?

There were two couples that went to my high school. The girls were best friends and had been for a long time. They were talking and one of the girls was saying that she and her boyfriend were having problems, so she asked her friend to go talk to him and see if she could figure out why he was acting so strange. The second girl went over o his house to “talk” and ended up fucking him. Ended up cheating on her boyfriend with her friends boyfriend. Started fucking each other secretly for months. Eventually her friend found out and there was a massive fight and both couples broke up, then the cheaters got together immediately. They’ve been together for 4 years now. These girls had been friends since they were in diapers..... I really don’t know how somebody could do that and still be able to look themselves in the mirror without hating themselves.

/r/AskReddit Thread