Shoot the Moon (1982)

Synopsis
Director Alan Parker and writer Bo Goldman chronicle the emotional disintegration of an unhappy marriage. Albert Finney and Diane Keaton play George and Faith Dunlap, a seemingly happily married couple living with their four daughters in a converted farmhouse in Marin County, California. George is inwardly empty and decides to have an affair with Sandy (Karen Allen), who has doubts about how long their affair will last. Faith is also suffering from ennui and takes up with Frank Henderson (Peter Weller), the contractor for the Dunlap's tennis court. Frank, after discovering about Faith's affair, is in a confused state: he wants to leave and live with Sandy but doesn't want his wife to date other men and demands the love of his daughters -- all of whom now detest him. ~ Paul Brenner, All Movie Guide