My Take on the Ending
I've seen this movie several times, and caught most of it on TV tonight. I watched the ending especially carefully--it was so wonderfully acted. Deanie and Bud obviously still felt something, even if it was just in those memories. However, I think there's an element of Deanie feeling like she dodged a bullet. I mean, after all: Look at how she was decked out, fine for a doctor's wife (to-be), but a rancher? (She obviously wanted to impress him and got dressed before she knew where he was.) When she walks away after shaking hands with Angelina, she briefly checks her dress for dirt. Yes, she's wistful about their little boy, imagining he could have been hers, but I think she also liked to hold him because he was such a part of Bud. They both say how they don't think about being happy, but I think the irony is that they wouldn't necessarily have been happy with each other in the long run.
The other thing (although fairly obvious, I guess) is that Bud "came down" from a rich family, but evidently felt fulfilled as a rancher, and Deanie came from a poorer family, but was about to marry a successful doctor. I think the "primal" attraction was still there, but I thought that, in the long run, Deanie would figure out that she's marrying the right person, after all.
But it's all very bittersweet, and I love how the story's played out with very INTELLIGENT acting, writing, and directing. I very much enjoy movies that count on the audience's intelligence, as well.