Okay im at a serious loss on how to go about this. A buddy of my FI recently got engaged (not exactly his bff but an ok guy if you know what i mean). Hes so happy with this girl and im happy for them...until saturday night. Me and a girlfriend went out of town to go to a kareoke bar. We got there and everything was going good.(FYI i was the designated driver that night so i didnt drink the first drop) and then i saw her. My fi buddys girlI was MAKING OUT with another guy. ok some of yall are thinking that maybe i mistaked this girl for her but im absolutly sure that this is her. thinking what i was i decided to get a closer look and headed for the bathroom (which was were they were making out) i walked right past her and sure enough it was her. she has only seen me a few times and apparently didnt recognize me. I went into the restroom and right after me she comes in too. she calls her FI and tells him that shes gonna stay the night with her "girlfriend" and drive her home cuz shes too drunk to drive. she left with the guy NOT a girl. What do i say? Im not exactly friends with this guy but id hate for him to marry her after what i have seen. will he believe me or just say im jealous or something? I dont have any proof. I havent said anything to anyone because i know if i do everything will be rumored and twisted and not the truth.