There is risk here that W will bolt, or that I will. Your W admitted a PA, as have seemingly many others on here, but mine is hiding things and keeping secrets, even though I have some circumstantial evidence that points in a direction. Our R may not make it, but I do deserve to know what the truth is.
J-Money......wait until 1 of vets weighs in as there are a couple different schools of thought on how to handle A's. FWIW....I asked my W twice if she was having an A and both times she said "no". I did some snooping before she moved out and could not find anything to confirm. Once she moved out I stopped snooping so to this date I still have no idea whether or not she was in an active A before we separated.
Let Sandi, TX, Stander, LH, Mic or another let you know how to handle as I have heard and read different philosophies on the subject.
The advice I got on the board was to not confront my W with circumstantial evidence because if she is having one it will drive it further underground.