In Auradon, Hades is escorted into a room, chained. His daughter Mal requires him to help wake up Audrey.

And of course, Hades can’t help but comment upon it with,

“When you guys try to destroy the world, it’s an error in judgement. But, when it’s one of us, lock ‘em up and throw away the key. Right, Beast?”

He turns to look at King Beast as he says this, who looks exasperated and replies with,

“Oh but you deserved to be locked up. After what you did to her.”

To you. Hades’ ex. Long ago, before he’d been with Maleficent, he’d been with you. His first love was you, and yours was him. But he left you heartbroken, for her.