There's a lot of heartache in this song, but I like the idea that it might not be a rhetorical question. How do I live without you? It might not be easy, but there's a way. Whether you've lost someone to adoption, miscarriage, death, distance, a breakup, etc., you always carry them with you as life marches on.
I've noticed how many love songs have themes that also apply to adoption. Probably because love is so central to adoption.