What is this feeling?

What is the feeling you get when your in love? I heard people mistake it for a flu. But what if you have butterflies in your stomach and you havn't even met this guy in person? Just a picture of him makes you squirm. You blush when your friends mention his name, and you can't sleep at night because all you can think about is him. When I can't find one downfall to him. Not one. He is hott, funny,smart, and sweet. I don't know if this is love or lust. I mean I have only met him yesterday. I never even met him in person.