No contact is NOT something she has a DISCUSSION about with him... she gives YOU her cell phone until you two do the work to get a new cell or a new phone number.
My wife did this too, I was ignorant at the time and left it in her hands. She was trying to explain to him WHY she CAN'T contact him anymroe... its just an excuse to continue the addiction...
Tell her if he has ANY questions as to why he can call YOU. Don't worry, he won't.
NO MORE CONTACT, and the ONLY note sent out is an email from both of you formally telling him to STEER CLEAR
Your wife has to respect these boundaries and you need to monitor them to make sure she is fighting to do just that. Addictions are very hard to break, AND I think you said this guy is single, so he has all the TIME in the WORLD to keep this up... if he was married you would be in a much better position, but since he's NOT, you really need to get on top of this.
