I am big into the hotpast kink. I have been for a few years now, ever since I got with my girlfriend and started discussing our previous sexual encounters together. I am generally a very secure guy, she generally makes me feel very secure, and the little sting of jealousy I feel when discussing her past hits more in a positive way usually than a negative way.

That being said, a while back - and well after we had started diving deep into the hotpast kink together and I felt like nothing could make me insecure at that point - we attended a party together where the guy who gave my girl her first and best orgasm ever also happened to be too (turned out he was friends with the new boyfriend of one of my girl's friends). I immediately noticed some tension in my girl when he got introduced to all of us, and I noticed some knowing flirty kind of looks between her and him too. I wasn't the only one to notice either, because in less than a minute one of my girl's friends asked "do you two know each other or something?" They both kinda smiled and then started laughing, then admitted how they knew each other (they matched on Tinder and had a one off hook up the same day).

Instantly, everyone was asking for details, which immediately made me quite mad. I felt like it was very disrespectful to me that they would do that. My girl didn't really indulge them, which I appreciated, but the guy was MORE than happy to answer every question at length, and he got VERY explicit and cocky and detailed about the whole thing. I tried to keep my cool because I didn't want to come across as jealous, insecure, or controlling. However, after a few solid minutes of listening to this guy showing off and talking shit, and my girl just taking it and even begrudgingly admitting that he was telling the truth a few times, I snapped.

I told the guy to give it a rest and that we'd all heard enough. All of my girl's friends and their boyfriends kinda "oooo'ed", like they were trying to egg us on and stir more shit. The guy just smirked and started giving me shit about being insecure. I started seeing red. I immediately resorted to physical threats if he didn't stop, which only got my girl's friends to egg us on more, and only got him more confrontational.

Things just escalated from there and I ended up calling him out, challenging him to fight right then and there at the party out the back. He agreed so we went out into the yard and punched on in front of my girl, all her friends, and a bunch of other randoms.

I guess my question is, do you think my reaction was justified? Do you think I was being insecure? Why was I SO insecure about it in the moment, when talking to my girl about that exact same hookup with that exact same guy only got me turned on before that night?

PS: We were all teenagers at the time, so this wasn't like adults who should have been more mature doing all this. We were dumb teenagers at the time, so yeah.