Well, I have just watched the movie again today........and this time I was looking for things I may not have noticed before.
As it just ended, I still have something in my mind about the scene with Alma Jnr.....Ennis asks her how old she is now, and she says 19....and I just realized the significance of that. She was the same age Ennis was when he fell in love with Jack up on Brokeback and I think that is why he went into deep thought when Alma Jnr said "Yes Daddy, he loves me"......
And then the "I Swear"....I know the meaning of that has been discussed here, and I have had my own interpretation of it before.....but now the significance of the age thing again comes to mind, and I think he is saying....."I Swear, if I were 19 again, and had my time all over again, I would have done it differently".
The other conversation I noted more carefully, was when OMT was telling Ennis how Jack used to say he was gonna bring Ennis up to the ranch, and how happy Ennis looked, and then OMT had to spoil that happiness by mentioning the Ranch Foreman. But the thing I noticed, was OMT said Jack mentioned the Ranch Foreman "last spring" which would have been after their last time together. Which indicates that Jack finally accepted then, that Ennis would never come up to the ranch with him, and it was time to move on. I think maybe Ennis realized that too, and maybe as he felt upset about learning about the Ranch Foreman, he also would have realized he had no one to blame but himself.
There was other things I noticed too, amazing, still seeing new things, after having watched it "lost count" amount of times.
Oh, the other thing I noticed, that when Ennis is talking to Laureen on the phone, he actually says the year 1963 when he is telling her he did some sheepherding with Jack on Brokeback.......and that seems to be when Laureen's demeanour changed, probably realizing that someplace Jack was 20years ago with this man, was his favourite place, as if the time in between that he had with her, was no where near as important than that time.