A lot of people do reckless stuff to try to save relationships. Relationships always devolve if no one fixes what’s actually wrong with them. You didn’t do anything wrong, I hope you had a nice time. I had one many years ago and it was pretty cool to be that sexually cavalier, being naked around multiple people, being hyper-sexual, casually. Having sex with friends. It’s wild. But it also taught me that I don’t think I can mentally handle that kind of thing in real life. It was amazing but it was also disturbing. Some things are better left in fantasy-land. But I digress. I hope you got something out of it, seems like you did. This guy has an easy scapegoat to blame his relationship failing on. You didn’t really do anything.