I guess this PI is going to be able to tell him that there is nothing really going on with you and Yacht Guy.. which kind of sucks since it seems to be a thorn in your H's side thinking you're moving on with Mr. Yacht Guy.
His behaviour is SOOOO OC or controlling. For someone that would go away with the ow before and not bother contacting your son.. and now he calls your Mom to get his way...