Cut the narcissist out of your life completely. Do a damn good job of breaking with him and be clear of your boundaries. The line is the front door and he no longer crosses it. Block calls, texts and email if you can and go to places where he doesn't know you will be. If you see him be indifferent and don't stop to talk to him, just say hello if he says something and keep going. Consider taking a restraining order if he begins to harass you and keeps knocking on your door.