Abbie's "Last words" is a single unfinished thought. The speaker says they never got their last words, and the sentence itself proves it: it trails off in the middle, with the final "to say..." leading nowhere. The form does exactly what the words describe.
The repeated "in the middle of" is the heart of it. The speaker was in the middle of a sentence, a text, a train of thought, so ordinary and unfinished that nothing about the moment felt like an ending. The poem suggests a death or a sudden loss, though it never says so outright, and the speaker may be someone who was cut off, or someone left behind imagining what went unsaid. Either reading fits.
The mood is quiet, stunned, and a little haunting. There is no anger or big speech, just the ache of something left hanging. The mention of a text makes it feel modern and familiar, and it reminds us that most of us never know which message will be our last.