Do you have doubts about her still seeing/talking to OM?
No, I am convinced she is not talking with him (it was mostly long distance phone sex, with 3-4 personal meetings). Although, if she is, that would be a dealbreaker for me, and I hope she knows that. I think she does. More of the situation was that the OM's wife was very unattractive (I've never met her; just third-party description), but a stable presence. The OM describes my WS as recreational sex (not his words), someone to have fantasy sex, with no long-term consequences, that is until his wife found out. Then that was that. I found out all of this ex post facto from the wife.
"The world breaks everyone and afterward many are strong in the broken places." - Ernest Hemingway, A Farewell to Arms, 1929.