Western Hearts (1921)

Vacationing college student Edith Caldwell becomes romantically involved with Jack Manning, foreman of the Diamond Bar ranch. Grace Adams, the owner's niece, is also infatuated with Jack, while being courted by ranch hand Pete Marcel. Edith and Jack plan to marry, but when she returns to school, the jealous Grace induces Pete to intercept the couple's love letters. After weeks of receiving no correspondence from Edith, Jack believes that she no longer loves him and leaves the ranch. Grace also leaves, telling her uncle that she has married Jack. In reality, Grace is married to Pete, a rustler who is stealing the Diamond Bar cattle. Jack captures the thieves and learns of Grace's deceit, resulting in his reconciliation with Edith.