My Personal Take on the Ending
So I don't go either way. I don't say they were going to live happily ever after or that she would ditch him.
I think rather that she clearly loved him, and she knew that, but she wasn't sure if she could ever be with him for a wide variety of reasons. She herself didn't know
But really what makes the ending so brilliant is that everyone has a different take on it depending on their personal attitude to love and romance and all of it.
"You gonna bark all day little doggie, or are you gonna bite?"