As others have stated, there isn't much you can do. But, one thing I would suggest is, sitting your wife down, explaining how it makes you feel that he still texts or calls, and that you'd like it to stop. Obviously, her approach isn't working. Is this harsh? Yes. Will she get defensive- you bet she will. However, if she is truly committed to being with you, she will do what it takes to truly get his guy out of her life. She will probably accuse you of not trusting her. Well, given her history, she's right. You may have to be very blunt with her. But, be gentle. You may have to phrase it like this- I love you very much and want our marriage to work. However, because of what has gone on in the past, sometimes I have a very difficult time moving past it. I want to totally trust you, but this lack of action is not making it easy. I also have suggestions of what she can say to him- since I had issues with a couple of guys I dated after my divorce was finalized. I hope this helps. Good luck, my friend!