Boy problems

One of my closest mates is a boy, but he's really complicated and is always doing stuff that pisses me off. Sometimes it's like he doesn't care about other people's feelings. Anyway, for my birthday I'm having a party and he wants me to invite these two girls that I've never met before. Well he's actually already invited them. I really don't want them to come but he said if they don't come then he won't come. What should I do?