I can sympathize completely. My W had an EA with a man who was a mutual friend and had been our guest a couple times at the lake last summer. In working through the aftermath, my W has been very open and answered any question that I have asked. I have a strong need to know. But I can hear phone calls that I was not in on. I have been to dinners that I did not attend. And a hotel that I never went to. In detail. Until this experience, I've always considered my ability to visualize things to be a gift.
This past weekend was our first trip to the lake this summer. I was in a rage all Friday evening and all day Saturday just being where I knew it all started.
As for coping with it, I have explained it to my W so she knows that I'm still having to deal with it. It does seem to be in decline as we continue to work on our relationship.