Brokeback Mountain and The Three Burials of Melquiades Estrada are about men who love each other in the alienating wilds of the frontier, where society is made of small corruptions and conventions. Brokeback is a big deal because sex and sexual desire are part of this love. But mosey on down to Texas and you'll find Tommy Lee Jones, wracked by what he believes is a do-or-die responsibility to fulfill a promise he made to his dead friend. Jones's character is as repressed and doomed as Heath Ledger's, all on account of loyalty, and their movies are as similar and different as can be. Three Burials opened wide Feb. 3, and it's a perfect companion piece to Brokeback.