Consequently, your first ally is knowledge about healthy and unhealthy narcissism. The more you know, the less you will fear. With knowledge and understanding, you will be able to stand your ground when the NPD (narcissistic personality disorder) individual puts you on the defensive. Eventually, you must face the truth about the deteriorating impact that this relationship is having on your life. Until you recognize that your avoidance of the problems in this relationship only contributes to more losses, you will likely stay in your comfort zone no matter how unsatisfied you feel.
-- Eleanor D. Payson, The Wizard of Oz and Other Narcissists, p. 168