Wtf do i doabout this crazy party situation?

I'm at a 21st bday party with my bf, the guy that likes me (and I think is kinda cute) my attractive girl friend and her hot boyfriend. Were all drunk the guy that likes me keeps getting too close. The hot friend boyfriend suggested a threesome in the shower and then there is my boyfriend seemingly oblivious to what's happening. I'm drunk and I just feel sick and nervous about the whole situation. Trying to avoid everyone. Help..