It has a very romantic feel, and also sad. Both has lost someone dear to them, and both were encouraging each other without knowing it, even before they learn each other's name. So yeah... Something like "Thank you for being born"
I'll show you another song with the same title, and yes, the same feel I'm trying to convey with this song also.
http://www.youtube.com/watch?v=H7s2Dwjbp_o




