" Any person who seeks to isolate you physically is a potential danger. If you enter into a relationship, a group, an organization, or a cult and you sense that this person is trying to isolate you from family, friends, co-workers, or people you feel comfortable with, you are dealing with a dangerous personality. If people care for you, they want you to flourish and be happy, to be with your friends. If they want to keep you from others (and they have all sorts of ways of achieving that, including using guilt or shaming your friends and family), just be aware that dangerous personalities use isolation for control. Everyone from Jim Jones to Ted Bundy used isolation to control their victims. Avoid it if possible. This also includes avoiding getting into vehicles "
― Joe Navarro , Dangerous Personalities: An FBI Profiler Shows You How to Identify and Protect Yourself from Harmful People