This quotation is actually something Richard would believe - because of Hastings, because it was discovered that he wasn't fully in agreement with all of Richard's intentions, the future king, after executing him, went on to doubt his other allies more and more. Doubt is Richard's tragic flaw - it causes him to kill his friends and be left without any supporters, and it all started with Hastings.
"She has a quiet confidence that screams loud. She is humble, but strong. She is stable, but rebellious. She is giving, but not naïve. She chooses her battles wisely. She'll stay silent until it's time to fight... and when that time comes; FIGHT, she does" Jordan Sarah Weatherhead #quotes