Jealous, idiotic boyfriend; help?

As a girl, I think you should cut off the joke, but not the friendship with the other guy. I would feel jealous if my boyfriend was calling another girl his wife and playing that he was her husband when I'm in the picture. It can be a little bit hurtful to think that someone puts someone else above you on their priority list (husband tops boyfriend, after all). Just make sure he isn't going to be jealous if you continue to be friends with the other guy after the joke ends! Good luck!