Like a theory I have is that T was patient 0, he was the guy who committed suicide in the prequel. G is some sort of moon god/demigod or diety who had fallen in love with T (from all the time T would stare at the moon growing up) and came down to earth after T killed himself. G somehow makes some sort of deal or uses his powers to stop death so T can come back to life. G then finds a dead body to possess or maybe puts a body together but loses his memory & his powers in the process. But like maybe this is his "punishment" or the "catch", that T will never love him or will hate him in the end??? Idk

What I want to know is what triggered this situation and when exactly did it start. T wakes up during the apocalypse right before G kills his dad but the apocalypse started way before that. Could the loop "start" there and resulted in retroactively starting the apocalypse (where no one dies and natural disasters)?????
G had said- "Stay here with me forever. In a world that never ends, where death doesn't exist". It's this that also makes me think that the apocolypse is not retroactive but that the initial event that triggered the loop happened during normal times-right before the start of the apocolypse??? It makes me think back about the initial chapter, the prequel, where the first body is found by some dude then disappears. Could that initial body have been G or T & it's around this time what triggered all of this to happen?