To be honest, I really do not like this arch, where the hero finds out that he was betrayed in the most cruel way. Too trite and sad. I do not read fan fiction in order to be sad, and before that there was no such mood in this fanfic. I hope that more of this **** will not be.
See, this is why you have a choise between a single world and multiverse hopping, you choose the former and tell the latter to go **** itself. What is the use of all that grinding and powerlevelling, if it is reduced to nothing in an instant you reach NG+1?