I look up people I dated to engage in schadenfreude
How do you engage in schadenfreude?
I'm constantly making fun of them and tell them how miserable they are.
That seems cruel. You should just let them live their lives and leave them alone.
Think about it this way. The more I let them hurt, the more I feel good about myself, so it is a good thing.
It is not a good thing to laugh at people that you just to be with. It is hurtful and people will think you are a bully for doing that to them.