A: Why did he continue to play psychological games with her?

B: His gaslighting was a deliberate attempt to convince her that she was losing her grasp on reality. And then he could control her.

Note: Gaslighting refers to an elaborate and insidious technique of deception and psychological manipulation, usually practiced by a single deceiver, or “gaslighter,” on a single victim over an extended period. Its effect is to gradually undermine the victim’s confidence in his own ability to distinguish truth from falsehood, right from wrong, or reality from appearance, thereby rendering him or her pathologically dependent on the gaslighter in their thinking or feelings. The term is derived from the title of a 1938 British stage play, “Gas Light,” which was subsequently produced as a film, “Gaslight,” in the United Kingdom (1940) and the United States (1944).