The poem follows a quiet, devoted figure, "she," who stays beside someone who is struggling. The imagery suggests that person is hurting themselves, since they "hold that knife," and she keeps smiling anyway, even as it breaks her heart again and again. She listens to their thoughts at 2 and 3 am, checks on them, holds them, and begs them to stay alive.
The mood shifts in the fourth stanza. Her patience wears thin, and she cries out, hoping someone will notice her pain. No one does, and she realizes the person she has been caring for is not there for her. The final stanza is cold and final: she leaves and never comes back, and the repeated "Never" closes the door.
The speaker sounds like a worried observer, perhaps even speaking to the person being warned. The feeling is sad and a little accusing, a reminder that people who give endlessly also have limits and need care in return.