The speaker is looking back at someone's death and asking whether they could have changed it. The poem suggests that "she" took a number of pills to numb her pain, and the speaker is left wondering about their own part in it. The central worry is a promise: they said they would be there for her, and the poem hints that they weren't.
What stands out is how plain everything is. There is no punctuation until the full stop after "today," and the lowercase lines make the thoughts feel unpolished, as if they're spilling out unedited. The questions are simple and repeat the same fear: if I had done something differently, would she still be here?
The ending is the most honest part. "i don't know" is short and stands alone, offering no comfort or answer. The mood is quiet, raw, and heavy with guilt and grief, and the speaker is left sitting in uncertainty that can never be resolved.