I believe these are the lyrics Aisling sings in Ballykissangel.

Oh love is teasin', and love is pleasin'
And love is a pleasure when first it's new
But as love grows older, love grows colder
And fades away like the mornin' dew

I wish, I wish, I wish in vain
I wish I was a maid again
But a maid again I ne'er shall be
Til apples grow on an ivy tree

Forgive me, love, if I forsook you
I was mistaken, I'll ne'er deny
But what can't be cured, love, must be endured, love
'Tis his I'll be til the day I die