Imagine being so mad about Azem that you play up hating them and expunge them from Convocation history for not aiding in the Final Days. But then you secretly make a crystal for them. Then make the title of your garlean official exiles, the Garlean word for "Traveler". Then you visit all the reflections and every location on the source and walk among the denizens there in their honor. But then when you have to sit still develop a traveling theatre troupe to visit far off locations to bring you back stories from beyond your domain. And the moment you meet even a sliver of Azem's existence from the Source, throw your entire backing behind them. Then see them fail and convince yourself they are a lost cause but still invite them to learn about their past and people in a faux Amaurot and then become the antithesis to solve the light corruption problem and leave them Azem's legacy to a ghost of your beloved friend.
In short, Emet-Selch is THE FFXIV Tsundere Emperor. Bar none.