There was no doubt that it was for different reasons that they were both pleased to know. Hermione, just for the knowing, and Ron because he now had a target in mind. She didn't like that and she knew what he was thinking, but she didn't have the energy to get into that debate at that moment.
Not following him for a moment, she eventually realised he was referring to Lia. Really? He was trying to gloat now? Hermione just stared at him.