Love story doesn't always have a happy ending.

Once upon a time, there is a boy playing this song to this girl, telling her that he gonna be her man, now and forever, but she gave up the love too easily, the promise could no longer be performed. She was once wondered would there be any difference if she tries to work out with him, however it's just a thought, decision made could not be changed. You will only know what happens at last if you continue walking that path. She has learned that there is nothing to be regretful, everything happens for a reason, it's in God's plan. If something doesn't belong to you, it will eventually be gone, however, if it is something meant to be, it will just somehow happen.

She just thinks of him, silently,

 everytime she hears this song.