This is one of those situations where seeing her like that caused him to die, and what was left was someone with nothing to live for, they took the one one good thing in his life and hurt the one person he cared the most about.
He is functionally a walking corpse, there is nothing he can do to fix her mental state or their relationship after she was raped thinking he sold her out, the only thing left to do is to get even and make them pay.
In a way this is the only thing he can do to free himself from the guilt of thinking that it was his fault that she was raped, even if he was not at fault, in his mind he likely hates and blames himself, the classics "if only..."