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I think that people sometimes don't understand the kind of abuse Belos put hunter through. He didn't just make him miserable and do nothing but ever hurt him. Hunter wouldnt have been so loyal if he had. Belos manipulated him. He made him think it was his own fault if he got hurt, he deserved it because he let Belos down. Think of the way Belos spoke to him during the last episode of season 2. "Why are you hurting me? I just wanted to help you." He lies to him. He probably HAS told hunter that he loves him. Probably when he was younger he DID show him affection, and then started withholding it. So he starts feeling withdrawals for it. He gets more desperate as he's forced to fight harder and harder to get it.
And on a similar note. I don't think people realize Belos not being able to control his curse wasnt a lie? Like we see him struggle to repress it on multiple occasions. As early as when he meets Luz in the past, we see when we see his arm with the glyphs on it, the way it ripples and bulges and he's obviously in pain as he forces it down. That's what happened in hollow mind; we see the mass of palisman souls are fighting inside of him. Thats his curse. All those souls he's consumed trying to destroy him. And then Belos destroys it, which gives him for the first time full control over his fucked up body. Before that he genuinely doesn't have full control of himself