Narcissists act they way they do because... they do. Whether they are broken people due to bad DNA, bad home environment, or a need to manipulate to survive, there is nothing you can do to make them change. Again: You cannot make them change. They won't change "if you're worth it" or "if they really love you" or "if you do more". They way they are works for them, and they aren't looking to change it... or you or anyone else.

The only course of action when dealing with a narcissist is to move on. Let them go. Gather your self-esteem and self-worth, turn your back on them and walk—no run—in the other direction. And if you're thinking that it will matter to them if you leave... it won't. They will find another victim very quickly, so your cutting ties will likely not affect them in the slightest. But that's not a reflection of your worth... it's a reflection of them NOT being worth anything beyond their own self-centered selfishness.

If you're currently in a long-term relationship with a narcissist, there's no easy way to disconnect. Oftentimes, your self-esteem and confidence have been shattered and you second-guess all your feelings. In those relationships, seeking an experienced counselor or professional is highly recommended.