My son falls in love every day. . . sometimes more than once. We go to the store and he'll find a little friend and be so excited to see them. He especially gets really excited when he sees little girls. He kicks and laughs. The other day he kept looking at a maybe 12-year-old girl and he did his fake laugh (really loud) and everything else he could do to get her attention (smiles, kicks, the oh so sexy ear shattering squeal that he does). He laid it on a little thick. He doesn't yet understand the subtleties of flirting.
Then they leave his sight and for a few moments he's sad. Then he moves on to the next one.
If he's anything like me this will go on until he's in his 20's.