Some say that Ennis did not/would not flirt with Jack and that their relationship was all Jack's doing. I disagree. Ennis was flirting with Jack from the moment they met. Your thoughts??
Of course their relationship wasn't all Jack's doing. It takes two to tango.
The one scene that comes to my mind immediately is the obvious one: "You may be a sinner, but I ain't had the opportunity yet." Look at his face, his expression, the smirk, how directly and long he looks at Jack, then looks away for split-second, then back to Jack again, then taking the whiskey bottle and looking back at Jack again, checking the impact of his words. I thinks it's pretty bold for Ennis' standards. I love him in this scene. Ok, I love him in any scene as most of you already know
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And Jack perfectly gets it. He nods and makes a pleased "mmm" sound, sounding like "aha" or "I see".
The things he does for Jack: ordering soup, switching jobs, shooting the elk. They are not so much openly flirting, but more like courting Jack.
And the teasing: "Harmonica don't sound right either.", the rodeo fuck-up remark, and so on. Friendly teasing belongs to flirting.
I don't beleive Ennis flirted with Jack from the get-go. Too shy, too confused by this fella and his own reaction to him. But he sure was fascinated by Jack from the very beginning.