[FFM] My (29F) Fiancé (21M) fucked another girl and I haven’t stopped thinking about it since

This was about 5 years back – we had been together for a year at the time and had been talking about having a threesome. One night, my work had a party and there was a new(ish) girl there who both me and my fiance thought was hot. She had a huge ass and she was pretty open sexually – she was a bit of a slut. My fiancé met me at the party and he thought I was all talk and that I wouldn’t actually fuck her/let him fuck her.
So I invited her to the next bar with us and we all got pretty drunk. I went to the bathroom with her and we got talking about our sex lives…I told her me and my fiancé had been thinking about having a threesome – before I got the chance to ask her, she offered. She told me she already thought he was cute and wanted to be fucked by him.
We went back to the bar together and made out in front of him, then I told her to make out with him.. it was so fucking hot.
We went back to my place, on the ride back I fingered her in the car and she got super wet. We went into my room and fucked, my fiancé licked her pussy and then slid his cock in while I was making out with her and playing with her tits.
Unfortunately, we ended up stopping because I had drank a little too much, basically ruining it for myself. The next day at work was super awkward and almost everyone found out! Which caused me to feel embarrassed for a little while – meaning I was scared to do it again.
But I haven’t stopped thinking about it since… I loved seeing my fiancé fuck another girl, I loved helping her feel good and making her wet for him. I’ve been craving it ever since.