My ex boyfriend is so rude to me for no reason?

He is trying to control you. That thing about him being miserable on dates is a lie. All he has to do is not go on them, yet he is. If you are smart you will cut off all contact with him, he is abusing you and by keeping in contact you are giving him the chance to do that. He sounds very manipulative, controlling and miserable. You do not need all that drama and abuse. Cut him out of your life.