I'm going to refuse to meet up with a friend despite not being busy
Why don't you want to meet up with your friend?
Because he called me and I don't like him anymore
I'm sorry your relationship is rocky right now, and you definitely do need time on your own to think about things. It wouldn't be a good idea to go ahead when you're not happy with your friend at this moment, it could cause more tension.
He can be so moody and I need space. He expects me to drop everything.
It is fine to turn down invitations but you should talk to your friend about it. You don't want to ruin your friendship over something silly.