This sounds so petty, but it worked with my now husband. I'm too proud to admit Im jealous, so I would never complain or even give away that it bothered. So, I just trained his subconscious to associate hanging out with a friend that's a girl with discomfort.

This is what I would do. I would make plans with a guy friend every time I could when he was out with someone you're uncomfortable with. Or just not be home and go off grid while he's gone so he doesn't know where you are or what you're doing . . . Things like that. Then come home and be all sweet and nice like nothing is wrong. He won't know why he's distancing himself from his friend. Just psychology my friend.