if he is staying with his parents I would not worry. He's not going to risk having them know something is up if he had other things in mind than spending time with them. Before he goes, apologize about your irrational jealousy and tell him you love him and trust him. If he had any straying thoughts, it might guilt him into to being good and respecting you for respecting him. if he never had any want to betray you, it will help repair the hurt of your distrust. I could be way off base though...