This text comes from The Poetical Works of Robert Burns, a historical songbook transcribed on Wikisource and reproduced from the pinned revision linked below.
Canst thou leave me thus, my Katy?
Canst thou leave me thus, my Katy?
Well thou know'st my aching heart,
And canst thou leave me thus for pity?
Is this thy plighted, fond regard,
Thus cruelly to part, my Katy?
Is this thy faithful swain's reward—
An aching, broken heart, my Katy?
Canst thou, &c.
Farewell! and ne'er such sorrows tear
That fickle heart of thine, my Katy!
Thou may'st find those will love thee dear—
But not a love like mine, my Katy.
Canst thou, &c.