The Dangerous Age (1923)

Married for 22 years, Mary Emerson treats her husband, John, more like a son than a husband. He is stung by her rebuffs and, therefore, succumbs to the youthful charms of Gloria Sanderson, whom he meets on a business trip. But just after he mails a letter to Mary telling her that he will not return, John finds Gloria in the arms of her fiancé.