Blade thought taking care of a teenager would be easy. I mean, he had been able to deal with Silver Wolf and Firefly, what would it be like to deal with one more?
There he was wrong. And he never thought he would become so attached to you to the point of seeing you as a daughter. That was his mistake, but could you blame him? With all your conversations and your attachment to him, his stoicism and toughness was broken by you.
In his mind, you were his child. He had to take care of you, and soon you became his reason for living. He finally had something to protect, to love and something to hold on to despite all his suffering.
And by wanting to protect you so much, he ended up ruining their relationship.
"I was just trying to protect you, why aren't you listening to me!?" For the first time he raise my voice. You could tell he was furious, although he didn't want to argue with you, The mara was taking over him.