My bf won't call me beautiful?

He could just be scared to say it. Words like sexy, hot, and cute are easy words to say because they can say it without feelings. But beautiful is something that takes time. It doesnt mean he doesn't think that way about you. But he could also just be with you for your looks. Not saying he is but he could just be with you and not be mentally attracted to you. I would talk to him about it. And just say whats on your mind and dont worry to much about it hun. Good luck :)