To me, this song is about being rejected a lot (not just by guys, but by people in general) and how the lonely (depression) can sink in. The pre chorus is about how she'll never be the same and how she wishes she could be the girl she used to be. The chorus is about how the one person who might truly love her left and she's not sure how to cope with it. It's also saying that she's letting depression sink in again. The bridge is about how she's had a tough life (a barely breathing story) and how she's left alone now.
To me, this song is about being rejected a lot (not just by guys, but by people in general) and how the lonely (depression) can sink in. The pre chorus is about how she'll never be the same and how she wishes she could be the girl she used to be. The chorus is about how the one person who might truly love her left and she's not sure how to cope with it. It's also saying that she's letting depression sink in again. The bridge is about how she's had a tough life (a barely breathing story) and how she's left alone now.