The narcissist who reels you in by highlighting everything he's done for others. I know this one well. He's never done anything wrong. He's under-appreciated. He's never taken responsibility for anything in his life. "I give and I give and everyone takes and takes."

I'm really impressed that you've mustered the courage to at least try to leave. If you want to make it stick, I suggest finding support. Someone who can either talk you through the process when he pulls out all the old tricks to get you to stay, or a therapist who can actually help you laid down an action plan and backup plans to get yourself out of this soul-sucking situation. You need emotional backup. You know what's right and you know what you want, but the narcissist is good at derailing that.