I'm sorry you have a bad manager. You are also likely in a company with a corporate culture where it is very difficult to let people go. Your manager may want

I'm sorry you have a bad manager. You are also likely in a company with a corporate culture where it is very difficult to let people go. Your manager may want to replace you, but it is too difficult or impossible to let you go unless you do something egregious, so he will just treat you poorly until you quit. No job is perfect, but I would bet you could find one where you'd be happier.