Sorry to hear this news pigskin. I know you are well aware that God cannot control other's choices including your W's and OM's and this is clear evidence of that. It is a painful lesson I have learned in my ordeal as well.
You were probably given this information for a reason, and with the right timing when you could handle the truth.
I have asked for God's guidance many times and for a sign of whether or not I should give up and move on on numerous occasions. I am not sure if I have received it yet. You may have asked the same questions and maybe this is your sign, or maybe not, but something to think about and it sounds like you are moving on to the next phase.
I used to think that a PA was a dealbreaker for me, but I am not so sure either way now. I look at what Puppy went through and I realize that you can come out the other side of that and I could envision scenarios where we could be happier than we ever could have before (I learned this lesson through Retrouvaille and the examples of recovered marriages I learned about there) but it would require a LOT on her part. Right now she is not capable of it and I know she may never be.
Relax, take some time to reflect, and who knows maybe the PA is what needed to happen for your W to wake up and realize that it wasn't what it was all cracked up to be and not worth throwing her family away over? You may then get to decide what you would need to move forward.
ME/XW:47 S21, D19, S15, S14 M:21 T:26 W moved 6/10 I filed 7/10 D final 4/12 remarried 8/12 W wants to R 12/10 and 4/11 but I decline