Personally, I think this song is about getting out of a long-term abusive relationship and trying to start over. In an abusive relationship, you end up distancing yourselves from friends and family, and keep making the same mistakes repeatedly until you finally have enough and move on. I think this is about looking back on it and realizing all the mistakes that have been made and realizing there's nobody left now that she's moved on.
Personally, I think this song is about getting out of a long-term abusive relationship and trying to start over. In an abusive relationship, you end up distancing yourselves from friends and family, and keep making the same mistakes repeatedly until you finally have enough and move on. I think this is about looking back on it and realizing all the mistakes that have been made and realizing there's nobody left now that she's moved on.