I have a relationship for many years. She is the girl of my dreams. We have perfect sex, very often and we try several new things.
We had a gangbang, me, her and an other guy we met once (we were drunk that night). We had a gangbang with him many times after that and we both enjoyed it.
I am a hetero, I never tried or wanted to try touching the other guy.
But that was the sexiest experience of my life and my GF was even more excited.
The thing is now I often picture her having sex with other guys, cheating on me etc and I get really horny. I find myself getting hard on the idea of her cheating on me.
I told her about this only when we are both horny, so she accepted this as a fantasy. I don't know if I have to tell her about my thoughts when we are not horny, because I think she will **** other guys right away and I am not sure about this yet, because I might regret it.
Any advice?