I wanted to get back to you about your situation. I totally agree that it's unlikely that the OW was just calling your H to discuss nothing but work. It probably is just an excuse to call him. She's a b**** for doing it. But, realize that your H is being honest enough to tell you who it is. He's probably getting disgusted with her, and may be feeling a little stalked. Obviously, if there were anything going on between them, they would be trying to hide it better. So, be his ally in this. Be mad at her, but do it without being mad at him.
Also, it occurs to me that it may be difficult, legally, for him to fire her. I can imagine a sexual harrassment lawsuit, unless the grounds for firing her are absolutely rock solid (I'm not a lawyer, but I've heard of such things). So that might be a factor in his thinking too.
