The speaker describes someone in deep emotional pain, and the poem's whole point is a distinction that's easy to miss: wanting to escape suffering is not the same as wanting to die. The first lines repeat the same pattern. "They don't want to cry" and "They don't want to cut" are followed each time by "they want it to stop." Crying and self-harm are treated as things that happen to this person, not things they choose, and what they truly want is relief.
The one question, "so why haven't they stopped it?", feels like frustration, maybe from the person themselves or from someone watching them. It admits that wanting something to end doesn't make it end. The final line brings back the repeated phrase, with "just" making it sound small and tired. The mood is quiet, raw and exhausted. The short lines and repetition make it feel like a thought going round in circles, which is how it can feel to be stuck in pain.