I want to recommend another interesting and informative article by Shahida Arabi (who wrote What Abuse Survivors Don’t Know: 10 Life-Changing Truths, which I posted a while back):
Many survivors of narcissistic abuse are confounded by the addiction they feel to the narcissist, long after the abusive relationship took a toll on their physical, mental, and emotional well-being. Make no mistake: recovery from an abusive relationship can be very similar to withdrawal from drug addiction due to the biochemical bonds we may develop with our toxic ex-partners.
Understanding why we are addicted permits us recognize that our addiction is not about the merits of the narcissist, but rather the nature and severity of the trauma we’ve experienced.
I recommend taking a tour around the site, since she has some great articles and resources there!