Lianna (1983)

dir. John Sayles Lianna’s life is a succession of domestic errands and boring faculty parties, and her heaviest cross to bear is dealing with her waning marriage to arrogant fellow professor Dick. In order to find intellectual stimulus, Lianna takes a college extension child-psychology course taught by Ruth. When Lianna catches Dick having an affair with a young coed, she finds comfort and eventually true love in the arms of Ruth. However, this comes with a price as everything in her life is turned upside down once her friends and family find out about the affair.