Exactly.It makes me think he's afraid of being confident. The "evil voice" doesnt sound evil it sounds confident, happy, determined. But because of all the times he was confident ended in his own suffering it's something that is negative to him. Be it when he was younger and determined to end it all or when he was confident enough let down his guard to let someone in only to be betrayed. Now he needs to be confidant and determined to see this through to the end. He knows he can be, but the power that comes with it terrifies him. He's afraid of the person he will become. As well he's aware of the fact that he is going to have to fully trust these people that he met only 2 days ago. Where he was just reminded of how someone he had known for months maybe years and trusted completely had so easily turned against him.
He's afraid he's going to end up like his dad.
He's afraid that if he gets the taste of what it feels like to be confidant and in charge, that he'll become hungry for it, and end up like his father.
He feels, now after Lily made it so obvious how cruel she can be, that he can't trust anyone.
He thinks they're just going to turn around and stab him in the back like Mapleshade and Lily. And it's just now hitting him that, Oh, I have to trust these people I've known for less then three days to help me kill this mad woman who just killed my mother. I can't trust them, I barely know them.

