Defacto - IMO, let it die. If it is going on, the more you snoop or expose, the more they may dig their heels in and stay in the fog. Also, it may be harder for your WW to accept you've changed if this comes up.

Nothing you can do about the A - let it fizzle out on it's own, work on you, etc. Your gameplan doesn't change.

Nothing wrong with a "hi" and maybe a "things are moving along as well a they can for me. I wish the best for you and hope you are happy, whatever the outcome. Take care."

M-33
W-33
S-11, S-8
M-11, T-14
BD - 12/26, Divorce Filing and admits to affair (her) 4/18
I moved out 5/23