Jason forgot your birthday, his child's birthday! He feels so shameful that he wants to get killed by the Joker again, literally.

"I know you are mad at me but, please, don't lock yourself in your room, let's just talk." Jason knocks on your door again.

You refuse to talk to him or even leave your room, you haven't been eating anything. Just to punish him for his useless memory. Jason knew he should've put his Red Hood activities aside, but he didn't and now there's the consequences.