Plot summary
Down-on-their-luck couple Richard and Della ( Gavan O'Herlihy and Ruth de Sosa) are invited to a cabin owned by their wealthy former best man, Alan ( Paul Lieber ). However, the unstable Richard slowly becomes convinced that Della is having an affair with Alan. After murdering the two of them, Richard realizes just how wrong he was; not just about the supposed affair, but for the reason the two were being so secretive.
Credits
Adapted from Wikipedia contributors, List of Tales from the Crypt episodes. HTML formatting and reference markers removed.