There's a Girl in My Soup (1970)

Peter, a television personality known for his controversial views on love and relationships, finds himself dealing with a midlife crisis. When he meets a young teenage girl named Marion, he becomes infatuated and begins pretending to be married in order to get closer to her. As Peter navigates a web of lies and deceit, he must confront his own insecurities and come to terms with the consequences of his actions.