Whats a perfect song about...?

I need a perfect song about a girl fallig in love with a boy she sees every sunday doesnt talk to and has fantasies that one day theyll bump into eachother or a song tht fits tht description. Basically, its gotta be slow or fast but i prefer slow and its gotta be about love and i geuss in the end they cam end up getting together or sumthing. i just need sumthinf tht fits most of the things i stated previously. Thank you!!!