How we cite our quotes:
She groped for words. I supplied them mentally "He broke my heart. You merely broke my life." (2.29.81)
Humbert finds the truth from Lolita. His feelings of culpability are confirmed: he really did destroy Lolita's life.
[…] nothing could make my Lolita forget the foul lust I had inflicted upon her. Unless it can be proven to me—to me as I am now, today, with my heart and my beard, and my putrefaction—that in the infinite run it does not matter a jot that a North American girl-child named Dolores Haze had been deprived of her childhood by a maniac. (2.31.1)
Humbert considers the implications of what he has done. How does it affect her? How does it affect him? What does it mean in the larger scope of things? Is he even sincere?
And there were times when I knew how you felt, and it was hell to know it, my little one. Lolita girl, brave Dolly Schiller. (2.32.4)
Humbert does actually experience feelings of empathy. But his urges were always stronger than his compassion.