Saudade

The Archangel Raphael was the first angel to feel romantic love.

They all felt love, of course. Love for each other, love for their creations. But romantic love? That was something he felt, first. A gift, alongside his Domain of Healing.

Camael loved him back, after a time. Was the first to kiss him, the first to say 'I love you'. And all was great. It was Heaven, how could it not be?

And then Samael rebelled. Dragged a third of the Host down with him, turning them against their family and friends. Raphael wasn't one of them. But some angels thought he was. And they made him Fall.

The Host have forgotten the Fallen, any relationships they once held with them. Only know that they were once angels, and nothing else. To keep them from siding with them, to keep them from faltering when stopping the Fallen from bringing men to sin.

So Camael doesn't remember Raphael. Hates him, in fact, for something he didn't actually do. That's fine, everything about this is totally fine.