it's possible for the heartbreaker to be more hurt ofcourse.. it just depends on the situation. it's also possible that both of them would be equally hurt as well.
one thing i know for sure is that guilt can ruin people to the point that theyd rather be dead just like the way heart break can.
there's those times when you cant help breaking someone's heart. you could try to make things work out but you know that they'll never work and you'll just hurt that person even more for sure. the more you hurt that person, the worse you'll feel. the best choice is to break that person's heart so as to not to inflict any more pain on that person. even if you don't have any feelings him, guilt will stab you each time you see that person, especially since you know how much that person's suffering because of you.

what's even worse is if he still loves you even after all you've done. it makes you feel so depressed.
id rather be hated and cursed upon cuz it's somewhat comforting and will lessen my guilt since i know that i'm getting my punishment for breaking that person's heart. if that person forgives me just like that, without giving me any punishment, i'll continue to be haunted by my guilt. that's why i'll avoid him and pretend he never existed so that he'll hate me. im selfish like that. i want him to hate me forever eventhough i know that it'll be easier for the both of us to forget and let go if he just quickly forgive me.