Discord wants to convince Fluttershy that she's not a bad friend after she admits to him how bad of a friend she feels she is, so he reads her his diary to help her understand.
After some hesitation, he decides to pick out one of his emotional entries: the Seventh Grade.

The year he ends up being unhealthily obsessed with his crush that drives himself insane.
The year he was used by his best friend.
The year he gets his heart shattered, and he stopped caring about others and prioritized himself.

The year he planned his rule of Equestria.

(Backstory includes Dislestia, but main ship is Fluttercord)
Proofread by Sereene-Serenity
Cover art is not mine