His eyes remain downcast, but there is nothing sullen in his manner.

'Her happiness is everything to me mademoiselle, I assure you. Good day.'

He bows deeply to her then, and tips his hat, and takes his leave. Perhaps another time they can talk of happier matters, and he can see if there is anything she needs. For now, it is best to withdraw. He must get away from this place for a while, he must see Cosette, and perhaps after that, he will be able to think again.