Regarding endings it's hard and easy at the same time to predict what's going to happen, hard because there's some secondary characters (sugu/simon/concil/admin...etc) with plot lines all over the place, but these plot lines only going to change how we get to the ending not the end itself, that one is very straight foward and kinda easy to tell.
The ending will be a mix of the same situation and depends if Kirito will be able to discover or not the affair and confront the reality
Ending number 1, he dont learn the truth or chose not to believe/confront the reality, disregarding everything as a big allucination like the ones he's having, as gossip from Sugu/Simon ressenting them in the process or over the council plans. He will not confront Asuna and she will keep banging Inoda on the side as usual, that will be the Oblivious Cuck ending.
Ending number 2 he does learn the truth and confront the reality but he does that in order to save his relationship with Asuna, he will confront her but he will forgive her and Inoda as well because the council was using them for the mind control plan, and also her past trauma/blockage will play a role here as she will not "remember" anything and and Inoda as well due to the mind control, and since as far Kirito knows the cheating only happened during FOG sessions everything will be put in the council's tab and the Fog team will continue as usual.
Asuna and Inoda will continue to fuck like rabbits behind Kirito's back both FOG and IRL eventually she will get pregnant and going to pass the baby as Kirito's. Cuck Ending
One thing in common that both endings have is that they only will apply for the FOG cheating, IRL Kirito will never know or in the best case scenerio he will be suspicious, but never going to do anything about it, even Sugu knowing it will make no difference, because he's never going to believe her anyway.
Now those are only theories about the endings, but i dont think Kirito will end in full NTS mode jerking off over Asuna getting her back blowing off by Inoda , and about Sugu/Simon he will cut ties with both of them, because he probably will learn about Sugu stalker/tsundere "actions" and Simon just because she was part of the council