The watcher said in the end that watching all these universes is my whole life and I started to imagine at the same time that may be watching my life is all i have and then crossing them to all universes and then if we imagined we lost what we wanted or who we wanted....the story we have is actually what left in our life rather we win or loose that story itself is only our content and each decision that we take at some moment decides our future and same goes for other some times you have to be cruel to kill something at point and if not then he can come for you in future because now he has got that ultimate power...the story teaches is so much why you should be happy no matter what happens...