Ghost Hunting Theories comes us with an interesting post to scratch your head over.
"...a woman breaks up with a man and he goes all psycho on her. His angry stalking does not mean he loved her more than other men love their women. It simply means his self explanatory style is not grounded in reality but fantasy. He's running around telling himself his life is over without her and thus he reacts as if he's trying to save his life."
Perhaps this is something you've witnessed yourself. Perhaps you are also guilty of this. In fact, I know you are. I am. We all have this tendency at times. I think the important thing is to be aware of this and make a conscious effort to avoid it in our lives and during investigations.