His reply was a bit cold but no matter how many times Zero said sorry, it wouldn’t change a single thing. What’s already done is done and what has happened has already happened. There isn’t anything else he can say on the matter.
He never once blamed Zero for his condition. He only cursed the bloodline that he was born into and given that he lived it out this long was pretty damn amazing. He was persistent at least. He’s still here and still doing things the way he wants to. At least there is some peace in that.