My wife and I have talked about her meeting another man and pursuing a relationship and she has told me that she has no interest in that. I'm ok with that. To be honest I'm not sure how I would react emotionally to that.
We expect this whole relationship to take time, trust and patience. Both of us ( My wife, myself and Her) talked about our expectations in the beginning so that there would be no huge surprises later on. We told her first thing that we were aiming for a poly-fi relationship just because that is something that not everyone would wanting.