It's been awhile so my mind is fuzzy,
why exactly does his world start to crumble?
Self-awareness? Fatigue?
I want to say it was the former because it adds credence to my thought that the final section is in his mind. Maybe he dies, maybe he is allowed to create his own reality. He can have the girl (though we all know the finer of the two wasn't in the field) and he can be the hero he desperately wants to be.
Part of me wants to scrap all this and call the movie bullshit on principle, but Monaghan aside I enjoyed most of this thing. I want it be better than it prolly is.