Helena Fitzgerald is a great writer:
The two characters from the first movie find each other again, but the point of the story is that finding each other undoes none of the losses of nine years before. They cannot ever go back to that single perfect day; even in love, you can only ever move forward.
Like a miracle, these two people locate each other again out of all the churn and unlikeliness of the whole world, but they can’t ever be with the young version of one another. The person they lost is still lost. They can’t ever have the romance they imagined having with the person they fell in love with, because that person no longer exists.