"Someone who is capable of leaving you without a real “heart to heart” talk basically lacks empathy and is manipulative. Some people, most often those with Narcissistic Personality Disorder or Narcissistic traits, purposely leave relationships denying their partners the decency and respect of closure. Why? It boils down to one thing and one thing only- Control."

- https://relationshipedia.wordpress.com/2015/04/20/why-you-should-close-the-door-on-the-idea-of-closure-2/