The Man Who Fights Alone (movie, 1924)

John Marble ( William Farnum ), a construction engineer is stricken by paralysis and begins to envision the growth of love between his wife Marion ( Lois Wilson ) and his best friend, Bob Alten ( Edward Everett Horton ). Bent on suicide, however, the shock of seeing his wife and child endangered on a broken bridge shakes him to recover from his illness and discover that his suspicions were all imaginary. -Written by Pamela Short, from IMDB.com