Does anyone know any songs about being in love with a boy who's in love with someone else?

There's this guy.. He was my best friend.. We were really close.. He called me Hon and told me he loved me and all that.. All the while, he had a girlfriend. They've been together for about ten months now. Well, he ended up shattering my heart, but I still love him with all of the tiny little pieces. And I know I should move on, but I can't. I'm in love with the guy.. :/ So, does anyone know any songs, preferably sad ones and/or by boybands, that are about being in love with someone who's in love with someone else? Oh, and please no Taylor Swift.. I've listened to enough of her music for the rest of my life.. Well, please and thank you?