I think my boyfriend's roommate telling me I can't stay over is ridiculous
Why is your boyfriend's roommate being difficult?
He's just being an asshole for no reason, I don't take that shit.
If  you are following the rules and respecting your boyfriends roommates, then you should be allowed over.
So what I'm supposed to do? My plan was to stay over and now I don't have anywhere to go.
Try talking to him and see where the issue is with him and you. Maybe you can come to a common ground.