Love....what is it all about...I get to wonder

Can I ask what is love? I mean is it the butterfly's in your stomach or it if you see that person, you feel this instant spaz like trembling? I been asked this question by alot af kids in multiple grades on my soccer an during school which by the way mu team won today!! Anyway when they ask I gave them this 'when you see them you feel like he's the only one their' but I don't know what to really say. And I'm not the one your supposed I ask for this, the guy I like I'm having trouble even saying hi. And seeing him hug this girl for like 2 minutes totally killed me inside. Though I heard he does that to everyone but is it just an reason to keep my hopes up? I as a person ask this question:
Can anyone tell me? Anything?