Why?

"Why? Why didn't you agree when the father was asking you? Why did you act like you've never loved me? Why, Yukino? Why?" he asked, his face exhibiting a variety of emotions. She blinked at him unsure. "Ano, Sting-kun? That was what written in the script". He smacked his forehead the moment those words left her mouth. Why didn't he die before doing this play?