The film “Two for the Road” tries to answer this question.
Two for the Road is a 1967 British comedy drama film directed by Stanley Donen about the twelve-year relationship between an architect (Albert Finney) and his wife (Audrey Hepburn). The movie was considered somewhat experimental for its time because the story is told in a non-linear fashion, with scenes from the latter stages of the relationship juxtaposed with those from its beginning, often leaving the viewer to extrapolate what has intervened, which is sometimes revealed in later scenes. The film largely takes place in France, with the central focus of each part being that the couple are travelling to the South of France on a road trip. Several locations are used in different segments, to show continuity throughout the 12-year period. The screenplay, written by Frederic Raphael, was nominated for an Academy Award. The movie was also ranked #57 on AFI’s 100 Years… 100 Passions.
From Jeff Shannon at Amazon.com:
Best known for light, entertaining musicals such as Singin’ in the Rain, director Stanley Donen grew more adventurous (and less successful) in the latter stages of his career, but this edgy romantic comedy from 1967 has proven to be one of Donen’s best, most enduring films. Jumping back in forth in time, the film chronicles the marital ups and downs of a stylish British couple (Albert Finney and Audrey Hepburn) as they travel on various vacations over the course of their 12-year marriage. The separate vignettes combine to form a collage of joys and pains as the young couple struggles to maintain their fading marital bliss. In this regard, the film is refreshingly sophisticated in its treatment of the difficulties of long-term commitment, and with Hepburn and Finney in the leads, great performances are drawn from the acerbic wit of Frederick Raphael’s screenplay. Fashion mavens will also marvel at Hepburn’s astonishing wardrobe of late-’60s fashion–she’s a showcase for summer couture, looking fantastic in everything from candy-striped bellbottoms to hip sunglasses and outrageously stylish hats. Some of the melodrama clashes with forced comedy (such as tiresome running gags or a cartoonish portrayal of crass American tourists), but that doesn’t stop Two for the Road from being timelessly appealing and truthful to the challenge of lasting love. –Jeff Shannon