Molly and Lawless John (1972)

Western - Molly, the shy, romance-starved wife of an arrogant frontier sheriff, finds herself drawn to a prisoner in her husband's jail. This prisoner, a handsome young man named Johnny, plays on Molly's sympathy and convinces her to help him escape. Molly then accompanies Johnny on his cross-country flight but soon learns he's simply been using her. Molly makes the best of the situation, however, and by the time the sheriff's posse catches up with them, Molly shows that she's learned how to assert herself. - Vera Miles, Sam Elliott, Clu Gulager