Im glad that Cosmo actually reacting to this with revoltion just like any sane person would. As much as I like Koto it wouldve sucked if he immediately realizes that shes being genuine and forgives her. Even if she is no longer a toxic gachikoi she still needs to face the consequences of her actions, and Cosmo deserves to let her have a piece of his mind.
From this point on whether they reconcile and start over, or move on with their life without each other, I content with either way. Whatever happens, theyve earned it.