I did a horrible thing...

I’m keeping this anonymous because I’m that ashamed of myself.

My boyfriend had a twin brother and when I say they look alike, they look ALIKE. Literally a copy of my boyfriend .

Anyway, it was Saturday night and my boyfriends , twin brothers, girlfriend threw a party for her birthday. Everyone was having a good time dancing and drinking. my boyfriend, his twin brother, his girlfriend and I all drank a little TOO much and I got extra tipsy. I don’t know how this happened but I woke up in a bedroom I’ve never been in before . I looked down and noticed I didn’t have any clothes on then I look over and I see my boyfriends twin brother naked as well. I don’t know what happened , I don’t remember doing anything with him. I freaked out and ended up throwing up everywhere . After that, there were bangs on the door and it was my boyfriend . I opened it and cried and begged him to forgive me because I don’t even remember doing anything and he got into a fight with his brother . I can’t stop crying . He left and in his parents house right now. I don’t know what to do! My heart hurts so much , I can barely type this because I’m shaking so much. What do I do?? I can’t lose my boyfriend , I love him to death.. please give me advice !!