Nickel Mountain (1984)

Henry Soames owns a rural diner, and has befriended Willard Freud and Callie Wells. One day Willard and Callie get the news that Callie is pregnant, and Willard splits. Henry takes in Callie, and helps her through the pregnancy. They fall in love and get married. All is going well until Willard is back from the road and wants the baby.