More than the ninth viewing certainly, I have no idea how many times I have watched Brokeback Mountain but I can tell you last night I watched it for the first time in a few years, I would say it has been about three.
What amazes me is how much this movie is a part of my being. Like an arm. There is not one day that goes by that I do not think about it. I listen to lyrics from the POV of Jack and Ennis's story. I still find myself balancing what the on screen characters do vs. the characters in the story.
Here is an observation I would like to make about the enigmatic "Jack, I swear" closing line.
In the motel in the 1967 reunion scene, Jack tells Ennis "I swear I didn't know we were going to get into this again" and goes on to speak the truth that he had redlined it all the way there, knowing it would happen. As the story progresses to the end, the last night in the tent when Jack tells Ennis he has something going with the ranch foremans wife, it sort of sets the stage. Ennis has been stringing him along all this time, choosing to know what he wants to know about Jack's life away from him and now he is given a peek.
He has already expressed his paranoia about people out on the street looking at him like they know. Now that he starts to know and is confronted with the revelation in the Trail Head Parking lot that Jack has been to Mexico, he threatens him with violence, with death specifically, and Jack does not back down. This threat, becomes a curse of sorts.
In some of my reading on the movie there is a reference to the deleted scene featuring the mechanics, the one that shows up in the trailer but not in the movie. Allegedly, this scene involves Randall dropping off at a garage to get help with his flat tire, and those people look at him like they know. When Ennis is told of his death, what he sees in his imagination is both his worst fears from age 9 to fulfillment of what he promised to do to Jack if he ever found out, which he did.
As he tells the Twists he can't begin to tell them how sorry he feels, he is blaming himself for Jacks death. When we reach that final scene, I believe what he is saying when he says "I swear" is that he didn't know what was going to happen when he spoke at the Trail Head Parking Lot, in a way, he is saying he is sorry for cursing him.
FWIW.