Whenever John Wayne and Maureen O’Hara appeared together, audiences could feel the chemistry. From Rio Grande to The Quiet Man and McLintock!, their arguments, embraces and fiery exchanges were so convincing that generations of fans wondered whether something romantic was happening when the cameras stopped.

The reality was different. Wayne and O’Hara became extremely close friends, but O’Hara consistently rejected the idea that they had been lovers. She described Wayne with enormous affection and later called him her “dearest and best friend.” Their bond stretched far beyond the movies they made together.

Their friendship also survived marriages, children, career changes and decades in Hollywood. O’Hara knew a side of “Duke” that audiences rarely saw, and when Wayne became seriously ill with cancer, she publicly fought for him to receive recognition from the United States government. President Jimmy Carter awarded Wayne the Presidential Medal of Freedom after his death in 1979.

Perhaps that’s why their chemistry still feels so authentic. They didn’t need a secret Hollywood romance to create it. Behind some of classic cinema’s most memorable love stories was something that lasted much longer than most screen romances—a deep friendship between two people who genuinely loved and respected one another.