My husband admitted that he didn’t expect anyone to want to fuck a 42 year old woman when he asked for open marriage

My husband asked for open marriage because he said he didn’t want to cheat but needed to fulfill his needs. He has been monogamous our whole marriage but after he turned 40 he said things changed for him. I was devastated and begged him to go to therapy with me. The therapist said my husband is perfectly sane but his desire for other partners won’t go away anytime soon. I moved out to my own apartment and took the kids with me. When he came to drop off the kids the next week I asked if he had hooked up with anyone. He said yes. I asked if it felt good. He said of course. I asked if she was pretty. He said yes. I then asked if he expected me to fuck other dudes too. He said of course. I asked if he wanted to know if I had hooked up with someone. He said of course. I said yes and he was visibly upset. I asked him if it felt bad. He said yes. He asked if the guy was hot. I said yes. He asked me to stop. I asked if he had expected anyone to want to fuck a 42 year old woman when he asked for open marriage. He said no. I laughed and said well you should have thought of that before asking for open marriage.