Not sure how to approach hubby

This may not be the right group and I’m sorry. My husband and I used to be in an open relationship kind of thing. (It was exclusive and closed. We had to tell each other who we were sleeping with and get permission first. So maybe more like poly. It wasn’t just strangers we had to know them. )

He kinda hurt my boundaries so we are monogamous. I am not interested in opening back up but I am interested in like a one night three way type thing. What’s the best way to go about this?