What to do next... sorry this stuff seems to be posted a lot but looking for more info

I have lightly brought up my wife sleeping with other men. She is always against it. She knows in my last marriage I was cheated on and she hates my ex wife. She even tried to be nice and got stabbed in the back by her. She has brought up the fear that my previous marriage ended when I have talked to her about sleeping with other guys.

I pushed her a little about a month ago. Through text I told her different things. She would get home excited and I thought she was really thinking about it. Then she said she didn’t want to but when she got home we had some pillow talk about it. I told her how hot it was and her major concerns

A) she has explored so much sexually me. She has learned so much about her sexuality. Been with plenty of past boyfriends and has two kids from two different guys. But she has never explored like we have together. So if we did this what happens next?

B) she doesn’t want anyone else. The fear of how our relationship might change. When we weren’t committed she had plenty of 2 week relationships. As well as I did two. But when once we were committed she doesn’t want to be with anyone else. I think the fear is the emotional connection might change

C) she is afraid I might cheat which seems common. I have reassured over and over. She talked with her friend (she chose a friend that would be supportive too of this subject) and her friend seemed to give her a go ahead if you want to. But also cautioned that it could be a phase. So now she has that fear.

When she explained these points I just listened and didn’t interject. After our talk She has been sexually active and recently started wanting me to fist her first before we have sex. We still have good sex. Although if I fist her it usually a week before we have sex again because I have big hands. She closes her eyes a lot or wants it from behind but if I ask says it’s just because she is enjoying it so much. I don’t know if her not looking at me really means anything other then enjoyment.

But my main concern is she made me promise not to bring it up again (but it was kinda jokingly a serious “pinky promise”). How do I approach it in the future? I try to not bring it up but hint and leave thing open for interpretation. But any further ideas would be greatly appreciated. Thank you