A single voice has enormous power over the speaker here. Hearing it brings them to their knees, "shattered," with a bitter taste left behind. Whoever this voice belongs to, it causes real pain, and the speaker doesn't hide how badly it breaks them.
Yet the poem turns on its last lines. A small part of the speaker never wants the voice to stop, and the closing admission, "i fear i will never hear it again," reveals the deeper worry. The pain is tangled up with attachment, so even something that wounds becomes something to hold on to. The dash before that final line works like a hesitation, as if the speaker is reluctant to say it out loud.
The mood is raw and quietly desperate. The short lines and plain wording make it feel like a confession, and the poem leaves us with a mix of hurt, longing, and the fear of loss.