What good can come from confirming it? It's information. Intelligence. You will know better what you are dealing with. You can make informed decisions for yourself. You can begin the process of learning about the concept of true forgiveness, even while the A is ongoing, if that is what you want to do.
Unfortunately, confirming is very difficult. I am torn on the concept of snooping. It can be something that can drive you crazy, but it can be helpful until you have at least either confirmed or snuffed out the idea of an A. Personally, I would continue to monitor phone records. That's how I discovered my W's, at the time, EA. It is pretty easy to spot if your W is spending tons of time on the phone with, and texting, an OM.
Either way, I would hold off on confronting W until you have more information. And I would NEVER divulge where I got that information.
I do want to forgive. I just don't really know how to prove an A since cell logs don't show the full story.
I think I see where you'd go... continue to monitor for evidence of A. GAL, GAL, GAL. Become more interesting, spontaneous, and mysterious.
M34 W35 S5 S2 T10 M6 on/off over the years including her A Recently- Nov 2015 bomb Nov 2015-Feb 2016 Reconciling Feb bomb March-April Reconciling May - bomb Mid-May I tell her I'm done