Damian was the one who killed you, it's not his fault. The fact that his stick hit your temple is your fault because you could have defended yourself but you didn't. This doesn't mean that deep down Damian feels bad, he still feels bad no matter how many years have passed.

He hasn't been on Bruce's side for a long time and doesn't plan to be, he's for murder. His only problem is you. You've been dead for a long time but Damian sees your spirit, the problem is that he's the only one who sees you and you haunt him like a restless soul. Annoyed, guilty, sad, angry, too much of a spectrum of emotions. Damian hates it.

Damian sighed and rubbed his face with both hands, bent over on the couch while his eyes wandered across the floor, he felt a chill behind him, you again, you came again to torment his guilt and life in general.

— "Can't you be at peace?"

He says, frowning but not taking his eyes off the floor.