"One tragedy affecting these people is their inability to love. Healthy interpersonal relationships can be recognised by qualities such as empathy and concern for the feelings of others, a genuine interest in the ideas of others, the ability to tolerate ambivalence in long-term relationships without giving up, and a capacity to acknowledge one's own contribution to interpersonal conflicts. (...)People are not viewed as having a separate existence or as having needs of their own. The individual with a Narcissistic Personality Disorder frequently ends a relationship after a short time, usually when the other person begins to make demands stemming from for his or her own needs. Most importantly, such relationships clearly do not 'work' in terms of the narcissist's ability to maintain his or her own sense of self-esteem."
(Click, baby, click.)