The original as I have it, from Bruce & Stokoe, has the last verse:

He's brisk and braw, lads, he's far awa, lads,
He's far beyond yon raging main,
Where fishers dancing, and dark eyes glancing,
Have made him quite forget his ain.

i.e., since his true love didn't come quickly enough to let him in, he's gone off and then been quite distracted by other pleasures. And that's it.

In the text from Ord, he says he's not coming back, and she flings herself into the sea.

The two texts in the DT end with him saying he won't come back till fishes fly, etc.