You know, there is a reason why the hero, the savior of the humankind, got sealed for 1000 years in this prison world. There is also a reason for his bitter attitude, too.
Are you kinda retarded? "I don't want" is not "I must not". He just chooses to not affect the plot as much as possible, because he is a fan of the story.
It's not like he would be punished by ruining the plot.