cobra, if I may chime in here, not only did Z leave his wife, he divorced her. And had an extremely happy and satisfying R with another woman (including great sex). But the guilt was too much for him and he went back to his wife who took him back but has never ceased punishing him. I don't remember how long since the D and remarriage, but it has been decades, I think. So, yes, he has called her bluff.
