Grey, I'm sorry to hear your WAW is remarrying. My WAW is currently in an EA (not PA that I know of) with a co-worker too. W and I aren't separated or divorced yet. However, if our R doesn't get back on track I fear the thought of her remarrying to the guy she's in the affair with.
I hope you can stay strong through this and your wounds heal.
Me:30 W:34 M:8 T:9 D:9 D:4 D:3 S:4 S:1 D bomb: 8/2014 S 12/2014 PA Confirmed in 3/2015 if I recall correctly