With Aziraphale being in Heaven without Crowley and any books or cake, he will have a lot of time to go through the last conversation with Crowley over and over and over again.
And I wonder if he will hear himself telling him to be his second in command and cringe at the suggestion.
If he will stand in the middle of a white room with nothing in it and in complete silence and think Lord, Crowley would hate this.
If he will touch his lips and then remember how he “forgave” him for it and wince.
If he will look at the Angels nodding to everything Metatron says while he thinks ‘wait… no’ and he will automatically turn to his left because that’s where Crowley would normally be, expecting him to stand there already making a face at Metatron - but Crowley won’t be there.
If he will remember saying “you’re the bad guys” and hide his face in his hands in embarrassment for throwing him in the same bag with other demons, as he’s ironically surrounded by pristine Angels who are planning the end of the World.
If he will sit there and suddenly everything will feel so heavy on his shoulders because Crowley, his rock, isn’t there to help him carry it.
When he cut the ties with Heaven, he began reporting his good deeds to Crowley. Crowley was the boss, the Heaven Aziraphale never had. Aziraphale could lean on Crowley and count on him to help him. Aziraphale was so happy whenever Crowley listened to his suggestions, asked if he needs help, builded up his confidence, told him he won’t leave him on his own. Aziraphale’s face was always so appreciative of it. He could not stop looking at Crowley with love and adoration.
But now Crowley is gone. And Aziraphale has a lot of time to think about everything he said to him.