Hermione looks at him, exasperated. He makes zero sense to her, his words and actions even less. And, honestly, she doubts he knows what he’s doing either. His loyalties and personal moralities switch like the weather and she doesn’t think she can rely on him for anything genuine, let alone follow through on something so important as delivering the locket. All she knows is that she can't trust him to keep his word. She can't even trust him alone with the locket.