19F, I have been sleeping with someone 24M. Feelings are involved but its long distance and not serious (he already said he isnt looking for anything like that). It is exclusive on my end however that was until i royally screwed up. Went out drinking last night with his best friend from where we live, and his friend's brother 30M. Me and the brother got blackout and we woke up shocked, can be presumed we slept together (also found out he has a girlfriend). He has already said he will not say anything but I am abit stuck on what to do because I do not want to lose this guy in case it could turn into something.
We have all done stupid stuff when drinking and I do not plan to be the bigger person in this situation, but I do know that if he finds out later down the line it will become so much worse. Is it even worth saying anything on the basis of me and the guy (30M) have said we will take it to the grave?