My merry, merry, merry roundelay
Concludes with Cupid’s curse:
They that do change old love for new,
Pray gods, they change for worse!

The speaker frames a light “roundelay” (a song with a refrain) that ends not in carefree celebration but in a pointed moral: exchanging “old love” for “new” invites misfortune. By calling it “Cupid’s curse,” the lines suggest that fickleness in love is punished by the very god who presides over desire—an ironic reversal in which love’s pleasures carry their own retribution. The repeated “merry” heightens the contrast between the song’s jaunty surface and its admonitory close, implying that courtly entertainment often smuggles in counsel about constancy, loyalty, and the risks of novelty.