My story is pretty complicated. I was 20 and she was 18. We had just gotten married as she had convinced me it was a fantastic idea after separating me from my friend group with what I later found out to be lies.
She started working at a sex shop that sells toys, BDSM stuff, pipes and bongs, etc. and we had just moved into our own apartment with a one year lease. We both started getting into the BDSM stuff and things were pretty fucking fun for about a month. Then she told me that she found a more experienced Dom that she wanted to play with. He was 44 and ex-military. For the first time in our relationship I said no to her about something serious. I wasn't comfortable with it, I didn't know the guy and frankly it just sounded like a terrible idea.
After she pushed and pushed for a week straight, I started feeling guilty and I was in love. I decided to suck it up and get to know the guy even though I was not comfortable at all. We went out for dinner a few times. He seemed really shady. I still wasn't comfortable and said no again.
At this point she flipped her shit and twisted it to make me seem like I was the bad guy, "If you don't fucking trust me to do this then just fucking break up with me!"
I should have divorced her then.
She just kept repeating that it would just be BDSM play and no sex even though I kept saying the BDSM part was really intimate and I didn't like that idea either. It turned into a huge fight and then she started crying because I "didn't trust her". So I caved.
She said she was really nervous and didn't want me there so I went to the gym to let them play for a bit. I said I'd be back in an hour. The apartment's gym was closed for maintenance so I came back 10 minutes later to find them fucking on my bed.
I broke down even though I had every indication that this is what was going to happen.
I should have divorced her then.
She convinced me that this was part of BDSM and that it was always a possibility when playing. Stupidly, and since we had been recently married and I wanted so bad to make it work, plus we still with 11 months left on the lease I tried to make it work as a "polyamorous relationship".
She lied about guys multiple times until I left one day while she was at work. She's still convinced she did nothing wrong to this day.