Yes, the MC is completely oblivious. I can understand why he would be upset and hurt, but he is also dumb. Can he not listen to what she’s telling him? She obviously cares about him spending a long time making his cape, to be willing to go through the divorce, he had mentioned he wanted to be an emperor before and she understands that it’s the way to do so. Instead of feeling hurt he should feel happy that she cares for him that much and express how he feels or that he has no interest in divorcing her, because he wants to be with her.