He was broken inside and completely hollowed out emotion, you can hear it in his voice. Nolan hurt him and Debbie so much they had to numb themselves.
Then, when Omniman dumps this huge responsibility, and his selfish mistakes onto him, he wants to disassociate and grow numb again, but can’t, since lives were at stake. It’s much more subtle abd heartbreaking imo. .
Disappointed more people don’t see it this way or find it bad. Mark hugged him on impulse, forgetting everything for a second, but he quickly backed off.