It's not easy loving someone with Narcissistic Personality Disorder. Dr. Craig Malkin offers a helpful guide to catching the signs of NPD early on in a relationship.
Narcissistic Personality Disorder. I learned that the formal diagnostic label hardly does justice to the richness and complexity of this condition. The most glaring problems are easy to spot — the apparent absence of even a shred of empathy, the grandiose plans and posturing, the rage at being called out on the slightest of imperfections or normal human missteps — but if you get too hung up on the obvious traits, you can easily miss the subtle (and often more common) features that allow a narcissist to sneak into your life and wreak havoc.
Via PAT NOVAK