Has anyone got experience of dating psychopaths/sociopaths?

After 13 months of mostly painful times trying to understand my bipolar boyfriend, he's now been diagnosed as psychopathic/sociopathic with narcissistic personality disorder on top. Please can you share your experiences if you've found yourself with someone this ill, and offer advice. I don't feel I can take any more without losing my mind as well. I would be grateful for any insight.