When he calls you, feel free to give him the silent treatment, tell him you are busy and that you have other, more important plans that you simply can’t reschedule or just ignore his phone calls. But be careful not to overreact because he might lose interest completely once he sees that he isn’t getting any feedback from you. Just play mind games with him, the same way he did with you. One day, act like he is the most important person in the world to you and the next, treat him like the piece of shit he is.
Make him beg for your attention and love, the way you were doing all along. Make sure you are giving him just enough of yourself to keep him hooked but to always leave him craving more. But be careful and don’t expect to change his ways by doing this. Don’t expect him to understand that his behavior is wrong once he feels it on his own skin. Remember that a narcissist always thinks that he is right and that there is nothing wrong with him treating you or anyone around him the way he does.