There have been a lot of comparisons between Laureen and Alma and their respective marriages to Jack and Ennis.
Opposites certainly did attract with Jack and Ennis.....
Ennis was a bully to Alma sometimes, and I think she was scared of him and his violent temper...he was very controlling and I think was very selfish...His job came first, obviously his trips away must have stopped Alma ever getting away with him, even their sex life was a one sided affair with Ennis doing what satisfied him and yet it was something that Alma hated....
I think, once Alma saw Ennis and Jack kissing, after getting over being upset about it, she probably began to take some control herself over the marriage, and where she was heading and what she was going to do....she may not have even thought that Ennis was "gay", but she probably thought that whatever it was Jack had with Ennis, was far more nicer than what she had with Ennis....seeing them together, was probably the first and only time that she saw a vulnerable side to Ennis.....
Laureen on the other hand was the opposite...she was the controller right from the start, and Jack in his placid way allowed her and her family to control him....it didnt seem to worry him too much, it worked for them both....she probably wanted him to take control, as shown by her smile when he finally stood up to her father at thanksgiving...
But.....I think Laureen was probably annoyed that something or someone other than her, was also controlling a lot of the things Jack did, and she was right, because Jack also did let Ennis control what was going on with them.
Ennis was the controller and Jack was the controllee in both their marriages and their own relatonship, but as it turns out, no one seemed to be happy.
Maybe thats what the movie wanted to show, how these two people, opposite in so many ways could endure such a long relationship, could love one another against all the odds.....it also showed that they kept secrets from one another, just as they kept secrets from their wives.....their own relationship was in some ways parallel to their marriages.
It seems like the whole 20yrs was a mess of control, of lies, of deception, selfishness and un answered questons....yet somewhere in amongst all that, there was still something pretty special going on......come to think of it....it was that, that controlled everything, right from the very start, and once again Ennis controlled it, and Jack let it control him.....