anon, i think you have misinterpreted the dialogue in that scene, tbh - imo he isn't saying "thanks to you" as in expressing gratitude towards her, he's saying "thanks to you" as in blaming her for forcing him to go through the hassle of making and raising another clone.
it's not really a demonstration of the pleasure he takes in hurting and punishing the clones. it's a demonstration of how he's a hypocrite who pushes the blame for his own actions onto everyone else and refuses to accept the consequences of his own behavior.
after all, he's the one who led Hunter and Luz into those memories. he was there the whole time, and therefore he heard Hunter asking to leave his mindscape immediately, heard Hunter defend him and justify his actions over and over again, etc.
on a metatextual level, we see those specific memories bc the writers are telling us, the viewers, a story about Belos and establishing his backstory, but in-universe, he could easily have just gone into like, a memory of himself in his workroom in the castle and raided a supply closet for everything he gathered for his trap. he took them into that series of damning memories on purpose.
he blames Hunter for 'betraying' him, but he's the one who showed Hunter all that stuff, and then when Hunter was understandably hurt and confused and tried to ask for clarification, he saw that as betrayal. he blames Luz for Hunter being in his mind in the first place, but Hunter asked to leave in his hearing and instead he decided to use them as bait for the palisman amalgam.
and going further back - this is a consistent pattern. he blames his brother for 'betraying' him as well, when what happened is his brother grew and changed and improved as a person, and it's clear from those memory portraits that he offered Philip the chance to be part of his new life.
he blames Luz and Lilith (and Witches In General) for mistreating him when Lilith breaks his nose, completely ignoring the fact that he tried to sacrifice them and then just blithely disregarded their pain and trauma.
he consistently treats everyone around him like absolute garbage and then acts shocked and appalled when they don't like him or retaliate against him or even just, like, try to avoid him. he manipulated, controlled, lied to, and abused every single one of those clones, then acts like he has No Idea Where This Came From when they separate from him.
it's just classic abuser logic. his feelings and desires are the full justification for anything he wants to do, but nobody else gets to have a full complex emotional inner life the way he does, because they only exist for him to do things to. they're toys for him to play with, not real people, and when they try to act like people or respond in reasonable ways to his actions and behavior, he sees it as horribly unfair and an attack on him.
nothing that happens is ever his fault. his behavior is never the problem. it's just everyone else refusing to understand him and maliciously attacking and hating him. that's the point of that scene.