Will you help me find a love song?

To be more specific, I'm looking for something that talks about love
that hasn't been found yet but expresses hope of one day finding it.
Sung by boy bands preferably and can be in ANY language
I would like it if it isn't depressing-sounding..
I am expanding my currently-narrow selection of genre in my iTunes
hehehe

Does anyone know of any songs like this?

Much appreciated Thanks :)