I've never heard a woman express any genuine concern for the nice guy whose heart she's just broken, only for the pain she feels at having had to inflict pain upon the poor guy. In general, if a woman causes pain to a third party, one is not expected to express sympathy for the third party, but rather for how bad causing that third party pain must make her feel. Except, of course, in that the degree of the pain being caused reflects positively upon her desirability.
Good: "He'll probably never get over losing a woman as wonderful as you."
Better: "There is no way he'll ever land another woman as beautiful as you."
Best: "You definitely did the right thing. But ending a relationship like that must be really hard for you."
Bad: "You know, dumping him out of the blue like that really hurt him badly."
Worse: "One day, he'll realize that the pain he's feeling now is a small price to pay for not having to put up with you anymore."
