The movies Single White Female and Fatal Attraction launched the phenomena of crazy chicks for my generation. Both were shocking at the time of their release and set the bar for obsessiveness. Indeed, 20-30 years on we still talk about SWFing someone or ‘bunny boilers’.
It probably means books involving characters obsessed with others are less surprising than they once were. Or perhaps less horrific (rather than predictable) because we’ve become inured in some way. Your Closest Friend by Karen Perry explores such an obsession, though it’s borne of a very unusual situation.