Replying to HOW should i handle THIS

ok NS so first of off this isnt my normal account i made this one because my friend knows mine and i dont want him to figure out who put this up so anyways heres the story

ok so i was with my friend in utah and we rented a condo there and just recently his sister told me that my friend and her brother ex gf had sex and i was on the pull out sofa apparently i didnt wake up but the thing is it was me and scott and dillion in one room and maddy and abby in the other but dillion was not in the room this night because he passed out on the couch and later the same night abby came in and had sex with scott and i was right next to them my delima is that this was dillions ex at the time and he found out about it but now i look at my friend in a whole new light what should i do ? should i ask him about it or should i just forget about it