Dream/ rant thingy

I always have dreams of my boyfriend cheating on me, what does this mean? Every time I dream about it he’s cheating me with two girls that I hate or am uncomfortable with him being around one of them he’s friends with and when we first started dating she asked him “why she’s so annoying?” And they used to have a thing in the past, and the other girl just pisses me off she dmed him asking him out when she knows we’ve been dating for a year and they also used to have a thing. Every time I bring the dream thing up to him he jokes about fucking them and it kinda hurts my feelings or makes me mad. Is this normal and does anyone know what the dreams mean?