But+in+your+day+this+moment+is+the+sunUpon+a+hill,+after+the+sun+has+set.

The speaker here suggests that her ex-partner is forgettable, but not the moment they shared together. “The words not ever, and the smile not yet,” are more memorable than the person. The words will never be forgotten because Millay made that moment into poetry.The last two lines are complicated. This is where it seems like there is Davison’s “dual personality.” That moment, although forgettable as the speaker claims, contradicts the “cigarette” and “jazzy’ them. The “sun” symbolizes energy and playfulness. Perhaps the speaker wants to emphasize that the moment the cigarette is lightened is the same moment where the affair was significant.