Ok, you know where I stand on this...let it go... He may just be resolving things by revisiting, who knows...my W has some "very interesting" ways of resolving stuff..,if taken at their face value, it is easy to think she is getting back into it, but she wasn't (and hopefully isn't)...her methods make no sense to me...but when she explained them to me after the affair in phase 1 of her mlc, she wasn't going back to start again, just "making sure" she made the right decision to stop... I know, it is "interesting", but it is what it is and how her mind works these past few years.
All that being said, IF you do confront him, make sure you are very centered, calm and VERY LOGICAL, NO EMOTIONS...emotional displays will most likely NOT WORK for your H, and might prove to him that you really are the problem (in his mind) due to the discomfort/pressure/frustration.
Also, be sure you are prepared to hear something you don't want to hear...don't make my mistake and not prepare for the worst things you can imagine, and some you couldn't....
Just saying, be very careful with and for yourself here...I truly understand your wanting to know, I do, I want to know from my W if her "explorations" are done, badly want to know. In my sitch, pressuring for that could push her back into the tunnel...I am letting it go, for now. Too fragile of a time.
My 2 cents, your mileage may vary...
T^2
In the depths of winter, I finally learned that within me there lay an invincible summer. - Albert Camus
Uncertainty is the very condition which impels people to unfold their powers.-Eric Fromm