The single-sentence stanza explains the reason for this abrupt shift in mood. The monosyllabic directness and the use of the second person in the line
You left me is plaintive and utterly lacking in ambiguity.
The speaker wants to be clear about the shattering consequences on him of this event.
Gone is the playful, poetic language of the opening stanza and so too is the speaker’s feelings of contentment, replaced by abject loneliness and isolation.
Hyperbole is again used to communicate the extreme emotional pain associated with parting, as he is left in a room with what he describes as
the quietest fire in the world.
This line highlights the suddenness of this new silence. This also creates an interesting paradox since the effect of being alone should only exaggerate the sound of the fire, when in fact it seems to mute it.
Effectively, the speaker implies the impact of this parting on him is that he is no longer able to hear and take any pleasure in sounds. His sense of loss is so profound it seems to have resulted in the loss of one of his most enriching senses.