It says plenty. It's got his eyes and thoughts flicking briefly in the vague direction of Remus, grateful and pained all at once.

He already owes Remus so much. What can he do to repay him for giving him his brother back?

(Let him go, apparently.)

"I'm glad. You deserve to have-- something different," he says quietly, before managing a more tired but genuine smile, "I don't want to be strangers anymore, either, Reg."