Most Helpful Girl
Yes, weirdly enough. For example, when my Grandpa died, I never expected my grandma to be as grieving as she was, cause when he was alive, they fought a lot, and had a HUGE rift in-between them. My Grandpa even had said that he'd "dance on her grave," if he went to her funeral.
But there was none of that with her. Even though she had her new husband with her, she cried like a baby.
Why? I think it's because death reminds us of how appreciative of life we have to be. It also makes us remember mostly positive times, mainly because nobody wants to talk about bad times, especially out of respect for that person. Also, funerals can be triggers. There's pictures of them posted everywhere, while they lay dead, in a coffin. Just seeing them dead alone, can make that person cry.
Most Helpful Guy
You made a fairly stupid assumption that breaking up with a person = you don't care about them. There are millions of people who break up and still maintain a non-romantic relationship with each other, whether it's causal boyfriends/girlfriends or ex-wives/husbands. Even if they do not maintain a relationship, you will notice on this board that many still have feelings for their ex years after a breakup.
Few are as malicious as you to wish them harm.