Is it normal that i don't miss my ex?

My on and off again boyfriend of two years have hit a bump in our relationship. I don't know what it is but I randomly found I have not want to be around him. It's like an irrational frustration. People have suggested to me lately that I show signs of serious depression, which wouldn't be from him. He's a caring and loving man who takes good care of me. It's complicated for me since I'm away from him now, getting help that I need to overcome my brains want to destroy my relationship but I've realized, sadly enough, I don't miss him. He's at home by himself completely alone and upset and when he calls I don't even want to talk to him, I don't want to see him. I don't know what it is. He was my world and then I go and take a shower and come back to hate him? I don't understand it. Has anyone else ever felt this way? Like, one morning you're completely happy with someone and even though they did nothing wrong, you don't even feel like you love them enough to kiss them? I just had to ask if I wasn't alone with this problem.