Given Edward’s surprise when Bella comments on his eyes, it seems like Edward doesn’t come across many people who are as observant as Bella is. She may be something of an anomaly among people. Then, when Edward sighs that Bella is so observant, he as much as confirms that he can probably read minds. Still, he’s not totally willing to be honest with her, hence the jokes and trying to avoid giving her answers. Touching his hand and noting that it’s freezing reminds readers that Jacob called Edward a “cold one,” or a vampire.