Again I have to stress that I haven’t seen the movie and it may differ from Annie Proulx’s story, but in the story it is clear when Jack and Ennis meet after they have married that Jack is getting his gay sex elsewhere.
*Ennis pulled Jack’s hand to his mouth, took a hit from the cigarette, exhaled. “Sure as hell seem in one piece to me. You know, I was sittin up here all that time tryin to figure out if I was—? I know I ain’t. I mean, here we both got wives and kids, right? I like doin it with women, yeah, but Jesus H., ain’t nothin like this. I never had no thoughts a doin it with another guy except I sure wrang it out a hunderd times thinkin about you. You do it with other guys, Jack?”
“Shit no,” said Jack, who had been riding more than bulls, not rolling his own. *
and later the last time they meet
*“You been a Mexico, Jack?” Mexico was the place. He’d heard. He was cutting fence now, trespassing in the shoot-em zone.
“Hell yes, I been. Where’s the fuckin problem?” Braced for it all these years and here it came, late and unexpected.
“I got a say this to you one time, Jack, and I ain’t foolin. What I don’t know,” said Ennis, “all them things I don’t know could get you killed if I should come to know them.”
“Try this one,” said Jack, “and I’ll say it just one time. Tell you what, we could a had a good life together, a fuckin real good life. You wouldn’t do it, Ennis, so what we got now is Brokeback Mountain. Everthing built on that. It’s all we got, boy, fuckin all, so I hope you know that if you don’t never know the rest. Count the damn few times we been together in twenty years. Measure the fuckin short leash you keep me on, then ask me about Mexico and then tell me you’ll kill me for needin it and not hardly never gettin it. You got no fuckin idea how bad it gets. I’m not you. I can’t make it on a couple a high-altitude fucks once or twice a year. You’re too much for me, Ennis, you son of a whoreson bitch. I wish I knew how to quit you.”*