We want him to be devastated. But he is not.
We want him to be deeply regretful but he is not.
We want him to be in mourning. But he is not.
We want him to pine for her. But he does not.
His behavior reminds of me of a aphorism from the tale of two cities. Whatever is, is right. He is marinating himself in whatever is' and accepting of whatever has transpired.
He is trying to reconcile himself with his loss, his hurt, and most importantly the one inflicted by him.
He is trying to move on.
Any regrets regarding her he will relegate to the background. And for now, the real world, which he is back to, is his forefront.
Their love will not be the tumultuous storm of passion that will blow them off their feet. Their raw feelings will ripen over time because they both touched each other at some visceral level.
This story is like a gentle brook that is meandering at its own pace governed by no desire to be a certain place but just the desire to flow. I think it best even as viewers to just enjoy the flow.