Clambake... just my 2 cents here but this is how I would handle this situation.
One, be very clear with him that he needs to back off, to stop contacting your wife, and if he does not, he will be hearing from the police and your lawyer. Two, if he contacts your wife again after this request, go to the police, file a harrassment charge and speak to your lawyer.
I am not kidding about this. Bullies need to be dealt with pronto or this is going to get worse.
I personally do not have the time in my life to deal with people who don't want to listen to what I say. Anyone who wants to push me, gets a very stern and formal response that involves the threat of legaI action. I have used this a few times in my life. And it is amazing just how effective dealing the authorities card can be. I have never had to go through with the threat. But I would if I had to.