You knew Kaneki way before he was a ghoul. The two of you were incredibly close. You would tell each other everything.

Then he disappeared for weeks. You wondered what happened to him-- if he was okay. If he was still alive. With ghouls running around in Japan, you were scared that.. what if..

He wanted to tell you. He really did.

Perhaps this was the best way to reveal his new self to you. A ghoul. Perhaps, as he grasped flesh and ate..

..he'd blame his obsession on someone else.