Thanks for all of the advice. It has helped with me taking no action and letting my feelings subside.
jmw -
I need to restate that this other woman my wife talked and hung out with was the woman I had an affair with and the reason my W gave for leaving me and getting a D.
RECAP:
Hung out last night with W, watched a TV show, looked at my vacation pictures, visited a little bit, and then she went home. Positives: she agreed to hang out and things were friendly; but not at all romantic. I will keep on keeping on.