We didn't do FPSs, but after about a year and a half of WH "going out to hang out with the guys" , leaving me home alone to babysit, I started playing an MMORPG. Same kind of thing as a FPS, but with role playing and fantasy worlds kind of thing. About 2 years pre D-day (which was me discovering years of his secret life and lies, lies, lies-which had supposedly stopped years[?] prior) he stayed home with me more often and played a different MMORPG together. He also
always bragged that I played with him and how "lucky" he was to have a wife that liked the same things he did.
I don't *think* he actually cyber'd or had an A with any of the people we were friends with in that community, but it certainly wouldn't surprise me if he did. Those games are full of that sort of thing, from what I understand. Oh wait, I did find chat logs between him and a transsexual male we knew that lasted all hours of the night, but I didn't see any actual sex stuff-that time. This is not to say that one or both of them weren't grooming each other for potential A material.
He had to take the one thing we did together and contaminate that with his selfish needs too? Was he that bad off???
My guess is: probably? In my case, it seems that when he was in full throttle "acting out" mode, he was all-in....that no area of anyone's life was safe.