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I’m emotionally ruined by the fact that Aziraphale hasn’t broken out of his heavenly conditioning. He still loves doing good. He gets happy when people tell him he’s an angel and says “it’s nice to tell people about the good things you’ve done now that I’m not reporting to Heaven”. He will literally put himself in harm’s way to make sure he does the Good and Right thing.
It can’t be understated how much Heaven’s influence still impacts on him. Aziraphale has been created, ordained and conditioned to believe it and he can’t just switch it off or walk away. Crowley didn’t get the choice. He was Fallen. He was kicked out and - as per the rules of toxic and terrifying cults - Aziraphale was always told for centuries and millennia, Falling was the worst thing that could happen. If you’re bad, you’ll be forced out. If you’re bad, you’re not one of Us. You’re one of Them.
When he did something he perceived as Right (ie. saving innocent children from death), but knew it wasn’t what Heaven intended, he broke down. Crowley found him a crying, shaking wreck afterwards because he was so convinced he was Evil. He was so convinced he was going to be dragged to Hell and that he was now a demon because he did one thing that saved some children but because it wasn’t a specific directive, it was Bad.
It shapes so much about him and it’s why the whole series looks like he’s having so much fun doing silly human things, but there’s this brittleness to it. He’s happy and excited and he’s doing his human-life things and having a lovely time, but he’s also constantly stressed because of the Need To Do Good. From the moment Gabriel turns up, he’s a nervous wreck and is trying to hide it by Doing Good, by Solving the Problem, by Fixing Things, by being so active and reactive rather than letting himself think about it. It’s a sign of exactly how frantic he is that he starts giving away his books and letting humans touch them.
Watch his face when the Archangels show up unexpectedly: that isn’t joy. That’s blind terror. He’s so afraid of doing the wrong thing in Heaven’s eyes, even though he made the active choice to do so because it was the Right thing to do. He’s a Guardian and he will protect, but he is so very afraid of the repercussions, even now.
At the end of S1, Crowley said “they’re gearing up for the big one” so Aziraphale’s not oblivious. He knows a big one is coming. He knows something worse than the Antichrist will be on its way. And he’s trying so hard to pretend that everything is normal and fine and if he ignores all the looming bad stuff, it won’t happen. If we don’t say anything about it, nothing has to change.
But then the changes come knocking at his door holding a box and the choice is gone. He can keep trying to blinker himself to it, but then there are angels and demons in the bookshop and he’s had to use his halo and everything is falling apart.
So when he realises that he can get himself into a position where he can guarantee those repercussions won’t happen to Crowley? He will absolutely take it. He says himself “I don’t want to go back to Heaven”, but the instant the Metatron offers him a free pass for Crowley, to take Crowley out of both Heaven and Hell’s sightlines, to keep him safe (Another bee inside the hive, if you will), no wonder he grabs it with both hands.
The tragedy is that Crowley thinks that when they saved the world together, that was the end of Heaven’s influence in Aziraphale. When he was cast out the split between him and Heaven was sharp and clean. He doesn’t - he can’t - understand how deeply it has tangled around Aziraphale. It’s built into Aziraphale’s entire being and unravelling it isn’t that simple. Aziraphale’s trauma is a horrible, terrible Gordian knot and Crowley can’t understand that he couldn’t simply cut through it, because that’s just not how Aziraphale works.