If you remember the game starts with Delita kidnapping Ovelia and he keeps her prisoner, using her as a pawn to consolidate his position within Goltana's realm, eventually killing off (or pretending to kill off in the case of Orlandu) most of Goltana's minions. Then he partcipates in the murder of Goltana himself while Dycedarg and Zalbag assassinate Larg.

Although nominally he is supposed to be loyal to Vormav and the Glabados church, he eventually double crosses them. Basically Ovelia learns of all this scheming and that he used her, so she wounds him and he stabs her in self-defense.

Meanwhile, the convential wisdom regarding Ramza is that he and all his followers died in the final battle. Which is why Olan is suprised to see Ramza and Alma riding off on chocobos. Olan eventually writes a revisionist history of Ivalice that gets him burned at the stake for his trouble.

Arguably the only people happy at the game's end are Ramza and Alma. Although if they didn't die, it's possible the rest of the party survived as well.