episode 41 really put into perspective john's relationship with oscar to me,
john almost lost himself in the dark world, he had to resort back to his old ways, he refused to forget arthur, arthurs his only friend, his beacon of morality, he'll never forget him and he'll always care about him.
and then he comes back. he gets to be with arthur, just those two together how he liked it. arthur is losing his mind currently, and john has to bring him back. he can't let arthur slip the way he did. he loves arthur and he doesn't ever want to lose him.
and then they go to new york
arthur, after only a couple days of having john back, start to ignore him for a new friend. oscar. john went through so much sacrifice to never forget arthur. john forgot himself before he forgets arthur. but to john, arthurs seemingly forgotten about him after only a couple days. and that must be fucking gut wrenching to experience.
of course john would hate oscar, of course, being so used to his old ways, he'd slip back into them to try to get his arthur back. he just wants to be happy with his friend. his only friend.