Like I said in your other post, I am an absolute bastard towards people that have done me wrong. She fucked you over. Show no love to her and that you care nothing for her. I would probably attend the funeral and give my condolences to the rest of the family (mom, her brothers and sisters, etc.). Maybe even send a card with everyone's name on it except hers. If she approached me at the funeral, I would turn around and walk away. She ripped your heart out and stomped on it dude. She has no sympathy for you. Why in the hell would you show any for her? She deserves it.