A couple months ago, my girlfriend and I had just broken up. I was devastated, so I went to the bars with my friends and started throwing them down. My ex showed up with another guy. I got hammered and ended up outside talking to another girl, my ex saw this and got jealous so on her way out of the bar she elbowed me and I turned to look at her and she was holding the other dude's hand on the way to her car, laughing. I got in a fight with the guy, my friend had to pull me off him. Well, last week, my friend, the guy who pulled me off this guy, ended up at my ex's place because he was hooking up with her sister. My ex had that same guy over and they were all drinking together, my best friend was there while this other guy was plowing my ex in the room not 10 feet away. A few months earlier I got in a huge fight w the guy and now my buddy is over at her place having drinks with him just so he can score with her sister. It's been bugging the shit out of me all week and I basically called off the whole friendship, he's done shit like this to me before. Everyone i talk to says i have no reason to be pissed, so i guess I am alone here. Did i overreact?