His heart sinks, because he doesn't know the right answer, and it's not right for him to lie. God, he wants so badly to do the right thing-- he's not so sure it would be the smart thing.
"I ... " He looks back at her, awkwardness writ into his posture. He hadn't meant to make this offer, right now, right here, like this. And there are times like now that he feels terrible for his relentlessly honest streak. "I don't know," he says.