You have to talk to her first rather than an attorney. The way you worded it, I thought you were through with her and that's why you were going to talk to the attorney! Dragging an attorney into your relationship is almost worse than her mentioning information about the affair. I don't know the entire situation, exactly what she said/words she used and that she knew your husband could assess the phone, etc. so can't judge the situation well. I can only see two ways I would go, if you are going to continue seeing her, you have to talk to her and solve any problems together, not have someone outside the relationship talk to her. If you are too upset to continue working with her, you have to tell her that and why and then get another therapist.