I'm not gonna lie, once that spark is gone... it's kinda lost forever; I don't really care about people in these situations, would a caring thought ease their pain? Would me being close to them while telling them to basically get lost be more, or less, beneficial to them?
I'd say if they need to hate me to get over me/it, cool, whatever works. I can't feign love, simply cannot do it; so when I said that I love Sieben, for instance, I actually, truly, mean that. So I won't even try to feign that kind of love or caring for people whom aren't going to take it that way, believe me, even when I tried to say we'd be better friends they'd sometimes go crazy and get all super depressed (don't need or want that kind of experience multiple times).