This song is so powerful and every time I hear it I have to stop and listen to it. If you notice, it first says "Is it fast enough so WE can fly away?" Then at the end it says "Is it fast so YOU can fly away?" Thus saying, in the end, she wants him to leave her.
@Saraghina Not quite. She wants him to grow up. She wants him to be a man but if he wont then he needs to get lost.