I want to go to my ex's funeral.
Why do you want to go to the funeral?
Because I want to know who is there and what they think of me
It is okay to be curious of what people think of your relationship of the person who died but you need to be careful about being appropriate. Those people are grieving and you need to respect that they will be sad.
I've already said my good byes to him. I don't see why I need to respect our relationship.
It's okay to have a hard time letting go of an ex especially if they pass away. You two might have had your differences but you can still go to their funeral and say good bye again.