This was posted on my Divorce a narc Facebook group - it really hits home for me:

"Remember in the moments they are suddenly “nice” again and you question your own judgement…
They live in an alternate reality of their own creation. In that reality they are perfect and everyone else is evil and deserves to be used as a tool for their own ends. They are always a victim. The lies they tell are not lies to them, but they are spoken as their truth. They have no conscience and all means are justified to achieve their ends, which in their minds are virtuous and just. They are like sharks, eating anyone they encounter because it is what they do. There is no thought behind it, no strategy, only an unquenchable thirst to control and then destroy.
They are incapable of true remorse. They may show you that behavior as a tactic, but it is only get get you into their jaws.
And after they tear you apart, they will move on to the next victim without a thought for you, unless your remains show a sign of life, in which case they will attack again.
They are a blight upon the earth."