If you had some proof that her affair was not unique and that your H has played women before it might put some doubt in there and cause a fight between them.
It would have to be VERY convincing to get her to believe YOU over him... I think you can see that.
Put it in your own perspective. If your H's Ex Wife approached you so many years ago and told you he had cheated before and that he has a habit of lying and playing women for months on end and then eventually abandoning them.. would that have phased YOU at the time?
What do you think or how do you think you would have reacted then?
You read the article noted earlier, I think you can see how deluded the third party is into thinking they are "special" and that their affair is somehow unique and above all reproach.. its nonsense but they believe it.
