It is a pity that the private message section of this site isn't activated, though I understand the reasoning behind that.
Gordie we are guided be who we let guide us and in a direction we want. People seek out anything that goes in the direction they seek. Two people could read the same self help article and get two completely different meanings/learnings from it.
I am not saying W intentionally sought out someone to tell her to D you. But she was/is unhappy. People even therapists seek to stop that pain and in some cases the quick fix is get rid of the spouse. I say fix but we know that fixes nothing.
I had a longer message but I am out of time. You cannot control or influence this part of things. I know it is hard to be a spectator watching something that you don't want happen. Just let it be and concentrate on you.
R 25 years M 14 years S11 & S13 Working on it alone since Oct 2014 M in trouble a lot earlier (~2 years) Feb 2016. 1st R chat in a yr. Next R chat Aug'17 Still together