Using People.

With Intent:  First person makes calculated use of their relationship with second person to further some goals mostly un-related to second person intrinsically, but which second person has some control over.  Example: Access to a private organization.

Without Intent: First person subjectively believes in their friendship with second person.  However, first person always takes second person out to clubs or night spots with the intent of making him or herself more attractive and ultimately leaving second person.

Somewhere in between:   First person asks favor of second person, whom he may know colloquially. Second person performs favor.  First person makes himself available for similar favor in the future.

The point: Nobody uses another person without justifying it to themselves.  True remorse is rare.