Thine eyes I love, and they, as pitying me,
Knowing thy heart torments me with disdain,
Have put on black and loving mourners be,
Looking with pretty ruth upon my pain.
And truly not the morning sun of heaven
Better becomes the grey cheeks of the east,
Despite the pain the Dark Lady causes him, she also perversely pities him.  The  personification  of the lady’s eyes as “mourners” echoes  Sonnet 127 , in which the speaker says: 
 Her eyes so suited, and they mourners seem…"
Sonnet 132