Re: In hindsight what changes would you do
I think that's roughly the idea. He believed in her, and she rewarded his faith. The attraction was always there, but their hearts grow closer towards the end of the film. I mean, he trusts and forgives her after she betrayed him in a HUGE way.
"You could have gone anywhere, been anything. But you came back."
"So did you."
"I guess we're both suckers".
Sums it up.