By the way, about open marriages...
My wife and I were at her relatives' New Year's party. And she showed me a couple with an open marriage, I talked to him first, then she came up to us. She has two lovers and he has a mistress, he can wait on the street or in the car until she is free, or she can also see him sitting with his lady in the car. They don't even hide it, but there is one "but". Open marriages concern ONLY these people, if she starts collecting dicks or he goes to whores, then it will immediately end in divorce.
I asked the reason for such a decision, they love each other and have a child, but neither she nor he could leave their lovers and were on the verge of divorce. But they were able to come to a mutual decision within very strict restrictions. I discussed this with my wife later, we could not do that, and other people for the sake of love, children, or something else, make such compromises. What seems unacceptable to us is normal for them.