We went out for a friends birthday to a club, and while there my girlfriends friend met up with a male friend of hers. They were obviously flirting the whole night and had apparently made out at some stage (I didn't see). She lives with my girlfriend [21f] so when the night ended we cabbed it home with her. Surprise, surprise, she invited him home with us. So we get home and they have sex. 

The next day she basically acts totally normal, showing little remorse and when I talk to my girlfriend about it the next night, she says they talked during the day and that she basically wasn't going to tell him and pulled out the standard "I was drunk" "I don't even remember it" "Please just forget it ever happened". I'm pissed, my girlfriend is pissed BUT she doesn't plan on doing anything. 

I don't really know my place here. I've met the boyfriend [21m] a couple of times and he's a really nice guy, but I'm really struggling with the thought of her bringing him over to hang out when I know what she's done. I don't want to be friendly with him and act like everything is fine, because I don't want her to be in a relationship with him any more. 

Please help me!
user
girlfriends friend [20f] cheated on her boyfriend [21m] by having sex with a male friend. Don't
assistant
We went out for a friends birthday to a club, and while there my girlfriends friend met up with a male friend of hers. They were obviously flirting the whole night and had apparently made out at some stage (I didn't see). She lives with my girlfriend [21f] so when the night ended we cabbed it home with her. Surprise, surprise, she invited him home with us. So we get home and they have sex. 

The next day she basically acts totally normal, showing little remorse and when I talk to my girlfriend about it the next night, she says they talked during the day and that she basically wasn't going to tell him and pulled out the standard "I was drunk" "I don't even remember it" "Please just forget it ever happened". I'm pissed, my girlfriend is pissed BUT she doesn't plan on doing anything. 

I don't really know my place here. I've met the boyfriend [21m] a couple of times and he's a really nice guy, but I'm really struggling with the thought of her bringing him over to hang out when I know what she's done. I don't want to be friendly with him and act like everything is fine, because I don't want her to be in a relationship with him any more. 

Please help me!
user
girlfriends friend cheated on her boyfriend, doesn't plan on telling him.
assistant