Lopez is suitably gung-ho with her succession of terrified reactions, but the biggest problem is that Guzman is mostly a smirking bore, too blandly handsome and one-note to give his character the attention-must-be-paid, home-wrecking spirit of a Glenn Close in "Fatal Attraction."
"The Boy Next Door" is rather obviously a gender-flipped version of "Fatal Attraction," the 1987 classic about an extramarital fling that turns into a nightmare.
The story is a gender inversion of Fatal Attraction (1987), filtered through a few recent scandals in which female high school teachers were caught fooling around with male students: the heroine (Lopez) is seduced by a charming hunk (Ryan Guzman) who's just transferred to her school, but he turns psycho on her when she rejects his subsequent advances.
1987's "Fatal Attraction," 1996's "Fear," and a whole lineage of similarly plotted "...From Hell" thrillers welcome a new descendant with "The Boy Next Door," producer Jason Blum's latest micro-budget effort from genre-centric Blumhouse Productions.
It's more a "Banal Delusion" than a "Fatal Attraction," though.