Define "The way he looks at you"

My aunt and I were talking about this guy. Now, this guy has made it obvious that he likes me (Meaning he told me (among other things)) And I had told my aunt that. Her reply was "I know, everyone can tell by the way he looks at you." What does this mean? When I said that he had made it obvious, I did not mean that bit, because I've never noticed the way he looks at me being any different than the way he looks at anyone else. Can someone define that "look"?

Oh yeah, I almost forgot to say: I've never been with anyone. Ever. I just don't feel those emotions. That's why when someone likes me I get so fascinated at how one can feel such strong emotions.. I'm just really curious and ignorant, and for that, I apologize.
Define "The way he looks at you"
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