She watches something fragile and sad fleet across his face and wonders, not for the first time, how much she doesn't know about him.
"Well, they say that familiarity breeds contempt, right?"
Other options:
no subject
She watches something fragile and sad fleet across his face and wonders, not for the first time, how much she doesn't know about him.
"Well, they say that familiarity breeds contempt, right?"