Despite his skepticisms, Rey isn't deterred.

"Yes, I do," she says, her expression softening. "I also know that you're a good person, and you're going to smile a lot more someday."

This much Rey can say without any doubt. Firo may be on his own now, but this 'family' he's told her about sure did seem to make him happy. He just hasn't met them yet, that's all.