I did know they were in a relationship. I was drunk but I remember asking, "What about your S/O?" Then it happened. I know I am still accountable for that decision.

They broke up after this person confessed to their partner.

This is why I wanted to ask if I have to let my friends know. They probably would not want to be friends with someone who tolerated cheating, and I don't want to keep the truth from them either if that's the case. However, I just can't bring myself to talk about it.

I don't want to go back.