I don't think its juvenile at all, I still have those feelings some times as well.
I think with time and maybe some space your perspectives will change but everyone is on a different personal timeline.
You may not realize you have moved into a new phase until you are already there.
I get the feeling of being unfaithful. My w has been out of the house for almost 11 months and I have had a few opportunities to date or explore female company or companionship and it is an awkward feeling to me.
I felt guilty and also unfaithful when I thought about taking that step.
So for the time being I am doing my best to work on myself and be the best father I can be. That is all I have control over.
I hope you session on Fri goes well. Keep posting.