Its purpose is to distinguish between and offer clarification for different types of emotional abuse.
They may take advantage of or manipulate others for selfish gains.
Example:Person A is performative around neighbors and friends for external validation.

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Psychopaths/Sociopaths have a flare for sadism.
He was incredibly cold, cynical, and callous, often detached from his emotions.
His feelings had a shallow range of being either happy or angry, with nothing in between.
He was very controlling in his relationships.
He thought it was funny to show his girlfriend disturbing videos, even though they gave her nightmares.
Borderline tendencies are synonymous with relationship instability, emotional dysregulation, and lacking insight.
These are often fueled from a constant fear of abandonment or rejection by ones peers.
Example:Person D always had a clingy, overly possessive, obsessive, me me me!!!
(His friendships had a hot/cold, love/hate quality to them.)
He was engaged in many self-harming and detrimental habits.
addiction, binge eating, impulsive spending, risky sexual encounters, etc.)
Overly anxious, unable to regulate these attention seeking behaviors and unhealthy coping mechanisms.
This is not to say all people with these specific disorders are necessarily abusive.
That would be a gross overgeneralization and an inaccurate statement to make.
These conditions can all present in different ways within different people and have varying degrees of severity.
With awareness, desire, willpower, dedication, and the proper treatment, having healthy relationships is possible.