After living with discord for a while, she has grown accustomed to him and his way of things. But once Fluttershy has stumbled upon somethings unusual for discord she sees him even differently than before.
She finds a journal where he has written down all the memories he has spent being a new found creature. He's entries are about his life before and present.
Fluttershy also finds some very heart felt things written about her.
See what is written is Discords journal.