* Why didn't Jack move to UsefulNotes/SanFrancisco or UsefulNotes/NewYorkCity? It was the '60s, on the dawn of the Gay Rights movement, he should have figured out that not everywhere was homophobic, especially not as homophobic as rural Wyoming or Texas.
** Maybe because he had a stable home life (as stable as it could be, all things considered), affluence, and a family. He also seemed a country boy through-and-through, so moving to a place like San Francisco or New York might rankle with him.
** It would have been much more difficult to see Ennis because of the distance, even if they only met up infrequently.
** Because they don't identify themselves as gay, and would have seen the urban gay community as completely alien.
*** This. Just because you are bisexual or gay, doesn't mean you are going to automatically fit in a stereotypical gay community. It is possible to have your gender role and sexuality be the same, the opposite, or some wild combination. They aren't mutually inclusive.
** Their professions did not really fit into urban life, and they themselves had probably no idea of how to survive and make a living in the big city. Also, in that time period, gay culture was not widely discussed in any event and by no means were the cities havens from anti-gay violence (still aren't in fact). This was why gay ghettos existed and gays tended to cluster together. The idea that they could have a "safe" life in a city might not have been something either of them would have really believed.
*** Jack was already tagged with the reputation of being a "queer". In the bar scene after Jack got bucked at the rodeo, he tries to buy a beer for the guy who helped him when he got bucked off a bull. He clearly had built a system to meet and find other gay men where he was (Note, he was seeing another man and its a good assumption, given his relatively affluent life and his wealthy father-in-law, he could find gay men in big cities nearby.)