So you’ve busted this person in your life–you’ve put “two and two” together; you’ve researched with tireless diligence the traits of narcissism, psychopathy, sociopathy, the “cluster B” personalities, and voila!–now you know …

How do we distinguish between your common jerk, abuser, and psychopath? Surely, the lines can be quite murky. If you’re a psychopath, by definition you are all three; if you’re an abusive …