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Also he truly loves her. Like even though she doesnt like him. Also even though he knows that MC already liked someone. He is still his knight, protecting her and still loving her.
The reason behind his love struck to the biatchhhh was the maid on early chapters thats why when she was gone. He doesnt care to biatchhhh
I read the spoilers about cassiel a long time ago. And i really do pity him. He is a kind guy