Is NOBODY wrong in the post ? POST : Calling him John. Me and John been friends since he was in middle school. One of my best friends, really close friends. We would always do childish stuff like moan or yell “pass the weed” if we were on the phone with our mom. As we got older it turned to stuff when we were around (or OTP with) our gfs/exes we would say stuff like “which one is that?” Or we’d name drop a friend of theirs as jokes. All the people in the past have caught on and understood that it was jokes so it has never been an issue. Now him and his current gf have been together for 3+ years. She knows the deal because we (all of our friends) do it a lot to each other. So We’re all cool with his girlfriend (despite her calling us gay for our friendship), but it’s not like we’re calling or texting her but if she’s around or OTP We’d say hi and have a quick conversation. So recently I went to his house to chill and talk about something and she was on FT w/ him. I heard her voice  and said “oh is that Sierra (his and girlfriend friend) you need to tell your girlfriend about her already (the type of things we all say constantly) then I laugh immediately like I always do then she says “tell gorilla to stop playing right now” she sound mad so I assume they were arguing and he looks kinda mad. He said he’d call her back and catches me up. Apparently she thinks he’s cheating with Sierra (he’s not) and they were arguing about it just before I came. She calls back a few minutes later and they go back at it and she says “see even your friend knows” he says “you know he’s joking” and I basically see that as my cue to leave. I dap him up and leave and they’re going at it. Last time I seen him he was mad and just basically called me an asshole but in a passive aggressive way. I think they might of broken up and my “joke” added fuel to the fire. I just didn’t think to much about it as it’s something we always do and usually she’s would say that he’d cheat with us before another girl, or joking say “oh is that right John I’m going to go find a new man right now” so I never thought she’d ever take it seriously. If it bothered her and she told him he would’ve told us. At the end of the day you guys decide. I don’t think I did anything wrong given our history but I could be wrong. 

TLDR: joked about my friend cheating, in front of his gf, with a girl that she already suspected of him of cheating on her with. This may have caused them to break up (or at least add to the reason). 