It's possible that your boyfriend is just very insecure and possessive and just doesn't trust you around other men, or other men around you.

It's also possible that the men in the dream represent aspects of his or your personality. It's interesting that all of the men you cheat with in the dream represent authority figures. Perhaps he has concerns about the level of authority and control you have or he has in the relationship.

I think the fact that a dream that he had - it's not as though you were fantasizing about these men - is causing him to have doubts about the relationship is a bit worrying.

It's normal and healthy to dream about people having sex with people they wouldn't be with in waking life.