Well her dear sister also came to him acting all nice only to stab him in the back. The King has been nothing but against him from the start. He just thinks it's some kind of ploy to get him to drop his guard only to betray him once more.

But yeah it seems that the Sword Hero is the only one who can actually think about the potential consequences when confronted bout it. Let's not talk about the idiot that is the Spear Hero.