My last ex invited her step brother ans girlfriend over for Christmas Eve before we went to their parents the next day. We were slready half done with a 5th begore they showed up. My ex was a drinker but the boys were smokers so we were smoking bowls while the girls drank. They demanded we get more but I said no so they went themselves and got a second bottle.

They get flirty and go outside. We went outside after a few minutes of silence but they were around the back smoking cigs. cool. but i was suspicious. We went back in without them.

not 5 minutes pass and I actually even changed clothes to make less noise. I creep around back and sure enough my ex was making out with her step brothers girlfriend. Yanked her ass up and told the brother. He understandably flips out. He and his girlfriemd get into it really bad. My ex tries to break things up before I pull her back and remind her I just caught my girlfriend of 2 years cheating on me on Christmas Eve with her step brothers girlfriend. Everyone fought.

I made the other two sleep on our couch since its dead of winter and they couldnt drive home , and I made my ex sleep on the ground while I got the whole bed to myself.

Come Christmas day, we go to her parents and she has to explain to them why her fathers son isnt coming. Needless to say we broke up not much later.