You have to stop thinking about them, it gives them power. And the narcissist will _always_ come back at some point. It's just a ruse to screw you over again. When this happens do a "gray rock" and either block them or give them one word responses. Whatever happens, do NOT give them any information about you. You may want to show them your successes, they love when this happens because you're basically telling them what you have to offer them. So if you have them on social media etc delete them from everything. If you do not then they will use this information against you. No doubt you want answers from the narcissist and they know this, which is how they reel you back in. Avoid the bait and the traps! This is how you win because it will drive them crazy because they thought that they had you figured out but now you're not doing what they expect. Trust me this makes them absolutely insane. Meanwhile you can move on with your life. Also if you only had to deal with it for a year consider yourself lucky. I had an "old friend" turn up at the door after many years. Within 3 months he was causing me all sorts of problems so I blocked him and 2 years later he's still trying to harass me by getting a girl he knows in my social group (who is now manipulated) to ask my wife for seemingly innocent information about us.