To me, though this may not be the meaning of the song, it's an extended metaphor. The song is a person who saved his life.
I can grasp that from the 'Sometimes it feels like you've known me forever', and 'I'm not alone, that I'll never have to be.' Some others too, obviously, but especially those.
It's like it was created to say thank you for a person who had helped him through the difficult times.
To me, though this may not be the meaning of the song, it's an extended metaphor. The song is a person who saved his life.
I can grasp that from the 'Sometimes it feels like you've known me forever', and 'I'm not alone, that I'll never have to be.' Some others too, obviously, but especially those.
It's like it was created to say thank you for a person who had helped him through the difficult times.