“Deep Water” (** out of four) was a torpid melodrama about a couple (Ben Affleck and Ana de Armas) in a loveless and open marriage; he looks the other way at her continuous affairs but this soon escalates into jealousy, deception, and murder. Director Adrian Lyne works in his usual grand and swank style but film is empty at the center since it moves at a snail’s pace (and byethway- snails are a key component of the story) and you really don’t care about anyone or their plight and film’s ending is more than a little frustrating. Lyne covered similar ground in earlier (and better) “Fatal Attraction” and “Unfaithful.” De Armas’ sexy performance gives film a stylish charge.