Have the discipline to not give up on yourself. Stay the course.

I was married to a covert narcissist and did not really realise the extent (or the impact) of the emotional manipulation until I had walked away from the relationship and had a bit of distance, (and luck) to put two and two together. I had moments of doubt/questions, months and perhaps even years in advance, but I chose to ignore the feelings, rationalise them away and convince myself that I was in love.