Curate, connect, and discover
Actually, it's really interesting how Crowley was right in episode 1. Keeping Gabriel around *was* endangering their lives. Beelzebub told him about the extreme sanctions, and Crowley learned how bad it all was, and he knew he had to go back to protect his angel. So he goes back to the bookshop and apologizes. Not because he was wrong though, but because he knows full well the angel made up his mind. Aziraphale WILL do what he thinks is right, even at the cost of himself. Crowley knows him too well. And so he apologizes, even though he was right, and spends all season protecting them both. Perhaps he doesn't tell Aziraphale about the book of life because he full well knows that it wouldn't make a difference. Save some kids and go to hell. Love a demon and be destroyed. Help an old enemy and be erased from existence. It wouldn't matter. So he spares Aziraphale the stress of it and he decides to help as best as he can. The result of it all being that Aziraphale sees all of this as him and Crowley teaming up to do the right thing, and Crowley sees it as saving Aziraphale when he knows Aziraphale won't save himself.