"And how would I show that I changed?" Because apparently simply saying it isn't enough for people to believe it. And he already made one mistake in this place that once again makes him untrustworthy. He still doesn't regret his actions, but that doesn't mean he hasn't learned not to do such things again in the future.

He doesn't know how to be good and well behaved. He only knows how to live and do things his own way. Caring about what other people think has not been a part of his desires or way of life. Having to suddenly change that is foreign to him and he has no obvious direction to go into to start figuring out how.