The 'truth'
SPOILERS.
To a point, I wonder if debating whether or not Elle and James are new acquaintances or a long-married couple is beside the point, but, nonetheless, here goes.
By the conclusion of the film, I'd come to a place where I felt that the married couple was the truth and the "we just met" line was the copy. Of course, I recognize that there are loopholes either way.
That's one of the most lovely things about the film. Even though it doesn't make empirical sense, it makes emotional sense. I think that, in the end, that's what really matters.
What do you think?
Shameless plug: I posted a review of the film at http://everythingyoualwayswantedtoknow.blogspot.com/