That is dangerous territory to cross. In my own sitch, the A was busted by S6. I had concrete proof with a witness. It helped, and at the same time it hurt beyond all imagination, even though I knew it deep in my heart.
Something you may want to consider is whether or not it will help the sitch move forward or not. Will confronting WAW about the A help establish boundaries and gain respect? Will it blow up in your face on speculation about phone numbers? Will it push the A further underground? These are all things to consider.
M: 8.5 T:10 Me:37 W:34 S:6
Retrouvaille and W moves back- 7/31/15 Piecing - 7/4/15 to present