Once you lose a person that you truly loved, you will feel these emotions expressed in the song. Brilliant to the nth degree.
The lucky few who have not lost a person that they truly loved may find the song less appealing, but to someone like me who would have given everything for that person that I truly loved, these lyrics are a comfort and a reminder of that person who will never know how much she meant to me. It's better to have loved and lost than to have never loved at all.