I assumed it was about a boyfriend or some other adult she lost that was close to her. Then I found out what the song is about. She wrote the song to her baby that she lost in a miscarriage - now the tears fall even harder when I hear the song. I've played in on repeat for two days and it's actually been therapeutic. I hadn't cried in a while (months, even) and it actually felt good.
Here's the video in case anyone wants to listen, but birth moms or moms of other loss beware; you may need tissues.