Poisonous parasite.

Psychopaths poison minds—that is their greatest skill. After they sink their claws into you, they begin to twist your words and manipulate your mind. You will never again experience someone who so carefully manufactures your every thought. Once you are free from their calculated games, you will be horrified to discover how deeply you were triangulated against perfectly good people, and led into a constant state of negativity & anxiety. And when the parasite is gone from your life for good, your free-will slowly returns as the false reality finally comes crashing down. You realize it was not you and the psychopath against the world—it was only the psychopath against you.