This song is about a guy reacting to a breakup (or perhaps more likely, a divorce). He's not able to move on and get over it because he insists that "this is not my life", and that "I live in the shadows...Because you are my life." "This is not my life" and "You took away my world" implies that he is now living single as opposed to in a relationship or marriage. Apparently she was the pin that was holding everything together, and now his whole way of life is altered. ("Do you remember our car/house/what it was like?") He had invested a lot into this girl and now she's gone, and now it seems like all the color is gone from his world.
This song is about a guy reacting to a breakup (or perhaps more likely, a divorce). He's not able to move on and get over it because he insists that "this is not my life", and that "I live in the shadows...Because you are my life." "This is not my life" and "You took away my world" implies that he is now living single as opposed to in a relationship or marriage. Apparently she was the pin that was holding everything together, and now his whole way of life is altered. ("Do you remember our car/house/what it was like?") He had invested a lot into this girl and now she's gone, and now it seems like all the color is gone from his world.