I hate the idea that if you became attracted to someone based on their looks first, that makes you shallow. While yes, that can be the case for many, most kids get attached to visually appealing subjects and he has spent more time with her since that first meeting. He may not be able to read her mood/mind, but he DOES makes a concerted effort to make sure she's enjoying herself around him.
TLDR: Not all romance should start with "love at first sight" but there's nothing wrong with it either, the human mind can be fickle and weird sometimes.