Season 2 Episode 5
A down-on-their-luck couple (Gavan O’Herlihy and Ruth de Sosa) are invited to a cabin owned by their wealthy former best man (Paul Lieber), but the unstable husband is convinced that his wife is having an affair. He finds that he was wrong about many things, towards the end of the show.
Source: Shock SuspenStories #11
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Tales From The Crypt: Complete Series
Tales from the Crypt: Season 2