Threads of kindness and compassion.
I can believe their happy ending, because the girl has softened, and they are both devoted to each other. He is extremely mature, with a capacity for joy among the daily things of life, which helps lighten her outlook as well. And she has depth of feeling that will feed his soul, their whole lives ~ So they will both be joyful and deeply content within each other, whatever else may happen next.

It's a book I might read again.
There is an aspect of the ending I would prefer to be different, but life isn't always exactly as we choose so it is unreasonable to demand everything in fiction to be.

The book includes a typical element of people from the city having refinement and villagers are less so, which I find offensive. But ! Tons of books across decades have that similar feature, and if I like the book enough ;) I manage t overlook that aspect.