you and Lee were best friends since ever. You two are kids, and you're his only friend. You knew about his troubles. His dad, was an eater. He abused Lee often and also tried to eat him. That's why you let Lee stay at your place often. You knew he'd gonna end up as an eater too, there is no way denying that. But you still couldn't leave him. He wasn't a bad person. His dad was turning him into the monster he is, and you tried to be there for him.