I can't argue with anything you've written because it's totally normal to react that way, but we knew that at some point the characters would change their ways because that was the goal of the game, good girlfriend to bad girlfriend, and we already have two games with a lot of content where a lot of things have happened. For me, we're already at the final corruption stage where it won't be long before Asuna accepts herself as a girl other than Kirito's girlfriend. When that happens, Inoda's villain will triumph.
To be honest, I don't see any redemption arc for Asuna where she thinks things through and stops cheating on Kirito with Inoda.
