so a friend of mine needs some advice and having never been in this situation i come to you he's been fucking this girl and after they had sex he found out she has a fiance so gc my question to you is what would you do if the same happened to you serious answers get +rep funny answers might get +rep
To be honest if it were me, I'd just get the fuck out of there. Cut off communication with the woman too. Let her get herself together and let you go get stoned
The fiance should know. He has the right to base his descision of lifelong commitment on truths, and not just perceptions. Ofcourse they might have an open relationship or swing, but either way its something that the dude should know about.