I don't think I care about an ex's suicide.
Why don't you care about his suicide?
He is just a person who has ended his life, that's all. He wasn't special to me.
You should care when someone dies. Your ex was once important to you and in your life, so you should be somewhat sad.
Why should I give a fuck? I don't have to care.
I just think it's nice to care about someone that was once a big part of your life.