Former "spoilers" said the Hinata rejected Naruto to go with the big bad, because the big bad made her forget everything about Naruto. That's what causes him to "realize he has loved her since he was a child". Or so the old spoilers went. Seems possible now.
I could have sworn that it said that her mind somehow only has Naruto (lol I know). So wait, what's the reason to marry her?