Looking for a suitable resolution, I thought it would be more dramatic if we had two people involved, so I rewrote the verses above:
"This year I will be good," she said,
"Work more and eat a little less,"
Made a vow, a nod of the head.
"This year I'll make sure I'm better fed:
A healthy diet, no excess.
This year I will be good," he said.
"I'll make an effort, won't be late to bed -
It'll do me good to get some proper rest."
She made a vow - a nod of the head.
"I'll save a bit; keep out of the red.
Have to cut down on evenings out, I guess.
This year I wll be good," he said.
Which gives more scope for the final verse:
They met at a party, sharing garlic bread,
Exchanged a number, an email address.
Remembering their vows, they shook their heads.
"Next year we will be good," they said.