Yall i got lost, why did they go back in time

pretty he's flashbacked to the memories of his past life and how they met eachother, I think it's also something to do with the fate rock aswell because he basically vanished out of thin air when he got a new notification from the red app

Misfortune will disappear as long as the quests are kept completed forever. no matter what pretty boy sees and learn about the past. That’s why the fate rock is making him see what happened in the past and he just vanished from the timeline he’s actually in