Don't feel stupid. This is a Sisyphean tail. You can Google the story, but basically Sisyphus is cursed to push a boulder up a hill, only for the boulder to fall back down before he reaches the top. Essentially meaning you're cursed to repeat the same task over and over, never being able to finish it. So teach has done this before and failed time and time again.
Okay so turns out the title actually means everything they are in a time loop base on Sisyphus a Greek king who tricked the gods and was punished by pushing a boulder uphill only for it to roll back down forever. His story symbolizes endless struggle.So they are in an endless tragic love story
Ohh okay I understand thanks
Thanks I understand now
I feel stupid, I don't get the end but it's still very shocking