[header] How to protect yourself from a psychopath [title] Call emergency services if you're in immediate danger. [step] Psychopaths are experts at manipulation, deception, and shifting the blame away from themselves. Your situation doesn't have anything to do with you being naive or an easy target. 
Instead of blaming yourself, understand that they mistreated you and that you're not responsible for their behavior. [substeps] The point to bear in mind is that a psychopath typically seems friendly and personable at first.