Love is like a rose, beautifully painful.
No that's not my answer, just a quote I heard that I think is sometimes true, well for those who've had bad experiences with love.
speaking from my point of view as a guy, I think love is the feeling you get when you look at the one girl you want to spend with the rest of your life and not regret it. I think it's when you feel as light as a feather each time you think, see or hear her, and yet strong enough to hold up the world on your shoulders. I think its when you feel like you'd do anything just to see her smile, and that you'd do anything to hold her world together.
Indirectly quoting from a book I've read: it's when gravity moves, when you see that one person, it's not like gravity is holding you here, but instead its that one person that is holding you on earth. (can't remember the book >.<)