You said it was sentient. It's not just a disease. You were a different man as a--healer. You took the plague, the plague that turned you immortal and twisted you into hating everyone, and then you called it sentient, and now here you are, without it, mortal, with impulses to care and to heal, that you haven't had for two thousand years--

So no. It wasn't you. It was the thing inside you.

...And the hell does your brother have to do with all this anyway?