Sounds like you crossed the line with the "friends with benefits" deal. Not many people can pull it off.

Tobias: You know, Lindsay, as a therapist, I have advised... a number of couples to explore an open relationship where the couple remains emotionally committed but free to explore extramarital encounters. Lindsay: Well, did it work for those people? Tobias: No, it never does. I mean, these people somehow delude themselves into thinking it might, but... but it might work for us. (Arrested Development)

🤦‍♂️Umm ok like I've said on here before statistically speaking open marriages are a horrible idea.95% will fail they will end in divorce(if you're lucky), prison or death but most likely statistically speaking you'll end up dead and your husband or lover will be in prison. Get your head out of your ass and grow up open relationship's rarely ever work in the long term. I can guarantee with about 95% accuracy it will eventually end very badly.

okay, I made an account just to say this, but I had to put in my two cents on open marriages. while it is true that polyamory is difficult to pull off, it is absolutely possible for couples to do it and not have problems. my parents are poly (and many of their friends are as well), and two of my best friends are poly. there is nothing wrong with polyamory, don't let anyone tell you different. imo, your mistake was having an fwb, which more often ends badly. I've done that and, in the end, those relationships didn't work out. feelings almost always happen. if your friend only wanted sex and no feelings, let them go. find someone who either wants both or is okay with both happening, or maybe don't be polyamorous (or polygamous). these kinds of things can be very difficult to navigate, but if you want to talk, I'll be here. I hope you can figure things out.