Don't let your H draw you or your son into anymore discussion regarding this issue. If he really and truly wants to talk about it, maybe you could suggest family counseling for the three of you.
In the meantime, you might want to talk to your son about the drama factor that results from actions such as the one he took. Has he ever seen the "Jerry Springer" show -- 'nuff said.
Also, God forbid that his contact makes the OW feel even more powerful and important than she is.
Remember, the OW is not the problem, simply a symptom of the problem.
