My wife (23F) and I (27M) started some weeks ago to open our relationship. We were clear that we wanted to simply have casual sex with other persons but that we wouldn't involve feelings.

She matched one time on Tinder with a man slightly older than her and her conversation with him was really intense (a lot of messages each day, etc...). Then when she went to see him, they had a date but didn't have sex. She told me that she didn't feel comfortable with the thought of having sex with him but liked their talk in person.

But she decided to don't see him again because she was thinking that she wasn't sexually compatible with him. Then after some days she mentioned me that she was having some little feelings but couldn't put a word on it. He was still on her mind. Fast-forwarding to right now, she's seeing him again tomorrow to have a serious talk about her feelings and see if she will keep dating with him or no.

I feel that the sexual part isn't her priority with him. I don't know how to feel about this because we never considered catching feelings for others and now I feel that she's going a little bit outside of our rules. And I don't know if I'm wrong or right ? Or how I should be reacting about this ?