The 1799 publication of A-TY'D-Y-NOS runs as follows:
(From the Levy Sheet Music Collection)

Fain would some with vows persuade me
A-ty'd-y-nos
That my faithful Swain has fled me
A-ty'd-y-nos
But my beating heart will falter
Ere it thinks that his can alter,
Ere it thinks that his can alter,
A-ty'd-y-nos

He's so constant I believe him
A-ty'd-y-nos
He'd be true did I deceive him
A-ty'd-y-nos
And I would not give him credit
He were false altho he did it
A-ty'd-y-nos