'P' is for 'What are the pairings in MSR?'

So, what is the pairings in MSR?  I get this question sometimes.

Well, the story is marked as BellaRose, but ...

But. Okay. Take a picture of your friends, does instagram say A is paired with B? Even though you're sure they are? Check back two weeks later. Are they still a pair? Two months? Two years.

When you're 100% sure, itrw, that a couple are a couple ... well, something else happens, and their story ... or 'life' changes everything?

Is MSR BellaRose, or is it BxE (okay, ICK! Seriously?) or is it RosyEm? (eheh)

I, as the author, know this. But do the characters know? Do you, as the reader, know how a story ends? One of Ursala Le Guin's best books, her hero died in the first couple of chapters. Her hero. So she had to write with a minor character for the rest of the story.

And it was one of her best books. If somebody asked her, a prior: "who is the hero of your book?" She would (or wouldn't) have told them: "oh, the hero is X" but then X dies right away after the introduction.

If you're guaranteed the ending before you start reading ... why read? where is the fun of it? where is the discovery in the story? where is your discoveries?

MSR isn't plot-driven, it's character driven. And there aren't ANY pairings (well, there's Carlisle and Esmé, but that is very slight to this story). The pairings are for the characters, and for you, to discover in themselves.

I mean the intro says "no Emmett" ... so what happens when Emmett shows up? Does Rosalie just dump Bella because Ta-DAH! Emmett's there so Bella can go off on her own alone now, or so Rosalie can kill the troublesome human?

And Edward, at the beginning, is smitten with Bella. So what happens when he shows up? Is Rosalie just going to hand Bella over and say: "Welp, you and Bella are supposed to be together, because that's how the story goes, so here you go!"

And how will Bella take that, being traded as a bill of goods? Doesn't she have any say in this, or, like in Twilight, is she to be walked all over, voicing her totally ignored views?

What ARE the pairings in MSR?

I think the answer is: "Hm. Well, yes, dear reader: what are the pairings that you see?" and "By you seeing these pairings, are they official? Or is there play in the story? Can something happen or are the characters' minds made up such that no matter what happens, they are for each other, no matter what, because this is the big-'L'-word here."

What do you think, having read MSR?