How can you be sure?

Seen all the good things and bad Running down the hill All so battered and brought to the ground I am hungry again I am drunk again With all the money I owe to my friends And when I'm like this How can you be smiling, singing? How can you be sure? How can you be sure? If you walk out the door Will I see you again? If so much of me lies in your eyes I am hungry again I am drunk again With all the money I owe to my friends When I'm like this How can you be smiling, singing? How can you be sure I don't want you? How can you be sure I don't want you? How can you be sure I don't want you? How can you be sure I don't want you? I don't want you, I don't want you anymore I don't want you, I don't want you anymore