Yes you're right. Everything is up to BR if she want to come back or not, because since the night she held SW's hand in his father's funeral, she was his destiny and no one can replace her. He can love other person, but he wont pamper anyone like BR. His decision was already made on that day.
Well, it was written in his textbook
"Come what may, I am prepared for the worst"
"Go where you will, I will follow you as long as I live