Yes, Puppy is right on. Aside from no contact letter and transparency he should get a new phone number. I would also still expect him to "relapse" Or HER. She will persist in trying to contact and he might try to contact her. It could be a simple 1 minute phone conversation or email. I don't know what others' opinions are on this, but since I see it happen in so many cases, I would just expect it. You tell him that if he promises to be honest and tell you when she contacts him, then you promise to not fly off the handle. Explain that you can work with him to help him stay away from OW and help him handle her.
I am curious to hear what others have to say about this. I am sure I'm not the only one who has observed that the OP tries to contact the WS even after WS sends no contact letter.
me,34 exH,34 S,16 months S:3/31/09-left for OW started DBing 10/09 d final: sometime 10/10 current: http://www.divorcebusting.com/forums/ubbthreads.php?ubb=showflat&Number=2022856&page=1 met in 2004