For how many times the two brothers been stuck in this loop of nightmare? They remembered their past, and they tried to change or break the loop. However, history never changed as what Queen Barbara said to the Queen of Pop Music.
Nightmare was bullied, and Dream tried to save him but unable to help him. The Guardian of negative ate and corrupted and died. The two of them battle against each other, then Dream turned into stone.
Killing Nightmare and used his and Dream's soul to recreate a new tree in their dead AU as the Guardian of positive died after planting it, and their cycle keep looping all over again which made Dream snapped and had enough.
The next reborn in their AU, Dream was no longer going to the villager and Nightmare seems to notice Dream's odd behavior and his expression telling him something is off. He tried to asked Dream if everything is alright, usually Dream would never lie to him, but now his smile is fake, and he had lied to his own brother, said everything is perfectly fine. Although, he could see it is not.
Dream or Haru (he called himself as a nickname after he and Nightmare decided to give each other a new nickname instead of Dreamy or Nighty) went out to the forest, having a break down that there is nothing he can do to stop this loop. He stared at his tears on the ground, almost giving up his hope and accept his fate to stick with their loop history.