Looks to me that the song is about opening your mouth before you have a chance to really think things through and then realizing that maybe you don't know what you want, but you know you don't want to be without that special someone (in this specific case, probably a girlfriend) because you didn't realize you wanted her until she was gone.
Looks to me that the song is about opening your mouth before you have a chance to really think things through and then realizing that maybe you don't know what you want, but you know you don't want to be without that special someone (in this specific case, probably a girlfriend) because you didn't realize you wanted her until she was gone.