
Oh he knows luce has feelings. He was betting on that actually. He thought he had him at the palm of his hands ready to do his bidding. That was why he was so caught off guard to know that luce plans to move away the moment their contract ends. And became mad cos he wants and assumes luce is gonna be with him for longer.

No it's definitely not 'love' more like he just wants Luce because he can't predict the way he's gonna act next, it's more like Luce intrigues and amuses him that's why he's keeping Luce by his side, he wants someonr unpredictable and inconsistent with their actions. I think some of the reason is also because of the way Luce doesn't have any bad intentions towards him, how pure and innocent Luce is, and how every action of Luce doesn't contain any malicious intent as every other nobles and knights that he has encountered as a prince.
Oh this made me realize that he knew all along the Luce actually bad feelings for him an loved him.. At least in my Perspective, it's been so long since I've last read the novel but the way he was so confident that Luce would not leave him gave me the impression that he knew, that once Luce fell he can never go back, he'll just fall deeper and deerper until he's forever stuck in the abyss, falling endless.