The narcissist label is commonly used these days when relationships begin to unravel. But, is your ex a true narcissist or just a run of the mill jerk? What you may not realize is that narcissism is actually a personality disorder. However, according to the Cleveland Clinic it’s pretty uncommon – up to only 5% of people have narcissistic personality disorder (NPD). Here are signs to watch for and tips on how to divorce more peacefully.