With the Devil in the Body (1954)

Believing he's committed murder, an unscrupulous adventurer, Lucio Márquez, flees town and takes refuge on a ranch managed by his brother Fausto. Fausto is an honorable man and is about to become engaged to the daughter of the owner of the property under whom he works. He warmly welcomes the errant man and lends his support. Until, disloyally and out of self-interest, his friend steals his fiancée. After struggling between her sincere love for one and her passion for the other, she ends up making a bad choice that could cost her her life.