I think the song is about a one sided relationship. The man desperately loved and wanted to continue the relationship, but the girl didn't. It is as if the girl entered the relationship just as a rebound, and there was never any depth, contrary to what the man believed. As the man pursued, the woman was already off doing something else. The fact that "Goodbye" is emphasized so much in the song is a compensation for the fact the word was never said, and there was never any real closure to the relationship. This makes the man have a false hope for a restoration, and therefore constant tears. The end of the song is the man finally coming to the realization that he was used and has a "knife in his heart." The end of the song is the man finally being able to say "Goodbye."
I think the song is about a one sided relationship. The man desperately loved and wanted to continue the relationship, but the girl didn't. It is as if the girl entered the relationship just as a rebound, and there was never any depth, contrary to what the man believed. As the man pursued, the woman was already off doing something else. The fact that "Goodbye" is emphasized so much in the song is a compensation for the fact the word was never said, and there was never any real closure to the relationship. This makes the man have a false hope for a restoration, and therefore constant tears. The end of the song is the man finally coming to the realization that he was used and has a "knife in his heart." The end of the song is the man finally being able to say "Goodbye."