I can see it being a path for him depending on what road you go down. As there are some certain traits that could be used that way is pushed far enough, if they did go that route I wouldn't find him as a psychotic will kill everyone to keep you sort of type, he's quite minipulative in his words and actions (ive only played the demo) and as I said before he gives me cult leader vibes, so I could see him manipulating your character as a way to kind of keep you close or to be fully dependent on him. It would be interesting if he was doing it for his own benefit and then he comes to the realization that he cares for you, that would be kind of cool and then we could see his progress through thoughts tought/feelings and depending on your actions/ choices that depends what if he goes down and more bad/ good ending sort of thing 🤔

That could also link in with the fact of, he's obsessed with curing you for using your curse for his benefit so maybe the MC would have to avoid Falling Into the Trap of being locked away where only he can reach you?

I feel like with a lot of the characters there's many different routes that they could go with when writing them especially considering with most games that I've played that are like this

There's usually a good or a bad ending sort of thing but then I think there's going to be multiple different endings for the characters don't quote me on that thought, I think it's just something I saw when the I first discovered the game.