This is for when your ex boyfriend has been stalking you and you go out to dinner and he's not stalking you this one time, but you can't enjoy yourself because he might be outside the window taking pictures of you and you don't know, and your fear is completely reasonable because he's pulled this shit before.
there is a lot of people who just have issues that can be the source of unhappiness (depression) etc. that may not have been created by an outside source. This is massively problematic in that a person stops learning to cope and just hunting for people to hurt. the lines get mighty blurry between victim and monster.