This songs meaning can be related to many things in their own individual way but (although related to a personal experience) the scene that starts to play in my mind is of, Indeed, a girlfriend and a boyfriend but instead of the girlfriend breaking up with her boyfriend I believe that she is confronting him very sloemnly and seriously about some wrong doings or suspected wrong doings on his part, as seems to me in verses 2 and 3. I do think it is pertaining to an actual death and life that was trying to be saved. After the girlfriend confronted her boyfriend he became angry that she suspects him of such things and in a rage breaks up with her (as many relationships end in a spontaneous rage, for a few days and then the two are reunited). The girlfriend, believeing she screwed everything up and lost everything she cared about commits suicide. The verses are a sort of flashback from the chorus which is the boyfriend regretting his actions, saying if he'd of known what would of happened he would of done anything to prevent it because he still loved her although he was temporarily angry. I Know that it sounds very complicated but from my own opinion and experiences that's the meaning I thought of when I heard the song.