Perhaps one of the more challenging things we want to do is to cultivate compassion for the narcissist. Substituting the word acceptance for compassion can be of great help as we grow accustomed to the concept. Be willing to try this.
The beauty of compassion and acceptance is this: it neutralizes the attachment you feel to the n, to the pain and the hurt of the relationship. If we stop throwing energy at the hurt and pain (and narcissist, even simply by continuing to fume about what happened), the power of the pain slowly fades.
Adapted from Narcissism: Surviving the Self-Involved