How did your 14 year old son have her e-mail address?
It seems like if he has an issue with his dad's affair, that he'd take it up w/his dad -- the person in this whole scenario who knows him, loves him, and owes him something. The OW has none of these criteria. And she didn't "steal" his dad, you can't "steal" a person. People make their own decisions.
I would strongly discourage him from any further interaction with this woman. It just creates more drama, more for her to talk to your husband about, etc. You should simply tell him that we don't involve ourselves with people whose conduct is so low.
This woman is just trouble. She is a liar and cheater at best. You don't want your son communicating with her -- do you??
