If you can’t stop smiling around someone does it mean anything?

[Rose00]

Other than your happy with that person it could be your sister, friend, girlfriend.

[JackSmy]

Every time I see a certain lady, I can't help but smile, and try to make eye contact, and just talk with her!! For me, I LIKE HER, A LOT!! But I don't know how she feels, but she remembers me, and smiles, when we do make eye contact!
Do you hear a certain song, in your head, when seeing the other?