The beauty of the glyph is that he can't easily tell that Anders' feels that he's stumbled so badly. He can accept the apology as an apology - and it is valid - but not get caught up in trying to reassure Anders beyond that. Which would likely just get them stuck in a strange cycle.

In short, it basically means they can move on with relative grace.

He tightened his fingers around Anders', stood easily and laughed. "You'll have to teach me to follow."