“Unforgettable” (** out of four) was a thoroughly predictable erotic thriller about a woman (Rosario Dawson) who moves to a new town with her fiance (Geoff Stults) but his ex (Katherine Heigl) turns out to be a nutjob who will stop at nothing to tear them apart and destroy her. Illogical and often dumb plotting undoes good performances from Heigl and Dawson. Final showdown between them is particularly disappointing. A completely unnecessary clone of “Fatal Attraction”/”Obsessed”/”The Crush” and too many others to think of.