sing without a song.

You step behind a curtain
In a moment you were gone.
Nothing's ever certain
And it's hard to carry on.

This is not what we planned
And I know its hard to understand
But if this isn't what you want then,
If this isn't what you need pry my fingers from your hand.

And maybe it's just meant to be
Maybe you'll find a way to haunt me
Come back and sing a melody to me.

Maybe we're just lost at sea
Maybe I'm holding on to driftwood
And I'll be alright if you could
Sing to me.

Help me make sense of what I don't understand.