He didn't ask to be brought back; I'm pretty sure the manga made that abundantly clear already. He was fine with the way he lived; hell, he might have even enjoyed it.
But then the girl forcefully brought him back and then forcefully tried to change his lifestyle, the lifestyle that he had clearly stated that he wanted to live, and somehow he is the bad guy here?
This would be like if you live in a society where keeping a pet cat is seen as good and keeping a pet dog is seen as bad and you yourself make the conscious decision to keep a pet dog because you like dogs and have no problem with society talking badly about you, but then you die saving a girl and you are like, "Ok, I have no problem with dying." Then the girl brought you back. At this point, the fact that the girl brought you back can be ignored because you didn't mind being dead but also didn't mind being alive, so either is okay.
But then, because the girl wanted to repay you for saving her life, she decided to make your life better by helping you change your choice so that society wouldn't view you as bad anymore, the choice of which is whether to keep a pet dog or a pet cat. She said that the dog that you have been keeping as a pet is bad, and you had to get rid of it and adopt a cat instead. And every time you said that you don't want to get rid of the dog and replace it with a cat, she gets sad and angry, saying that your choice is wrong and you have to change it, and all while this happens, people from outside of the circle, which is the representative of us, the reader, also say that you're an annoying pain in the ass, and your choice of holding onto the dog that you have lived with for many years is cringy, and you should have just listened to the girl.
Do you see the problem now?