He didn't fight Sukuna.

At that time; (Shinjuku Showdown Arc), it was a surprise to everyone that Gojo refused to fight Sukuna, for everyone it was more like refusing an obligation. It was a disappointment, Gojo should fight like the others and refusing is negligence, he is sending others to die in his name. In the fight many deaths were caused and everyone thinks it is Gojo's fault for having refused to fight in the first place knowing that he is the only one who equals Sukuna. He knows that people had died and it is true that he feels guilty, what would have happened if he had fought and defeated Sukuna, avoiding the deaths? It will remain a question mark.

People began to see him as an egoist, Gojo himself started to believe it too.

— “ Was it out of egotism? ”

Who could he ask that question to? He didn't really have anyone, much less since he disappointed almost everyone. But it's true, he had you, but not you. Why? Because he still thinks you think of him like everyone else; like a selfish person. It's not like he thinks you're with him out of genuine concern, he sees it as pity and he doesn't want any pity, less from you.

Maybe it was because of shame, maybe because of the pressure, but he quit sorcery and it was no longer easy to find the 'strongest' sorcerer. Still, he isn't a sorcerer anymore so it doesn't matter now. Besides, he isolated himself in his new rented house, he literally did not leave that place no matter what and the one who brought him food and necessary things was you, you were very sure that if you didn't do it, he wouldn't do it either.

As always, you had just come from the store after buying food for Gojo, when you entered his house the surroundings were the same as always; a dark and cold place, curtains covered the windows and the door to all the rooms were closed. As you walk deeper into the house halls, the only door that half open was Satoru's room, he had always leave it half open for you to enter when you want.