I feel like he just needs someone to actually care about him, it seems like that's what makes his excitement grow, that at least they are interested in him, they "desire" him to some extent. Clearly his grandma cared about him but she can't take care of his wierd urges. Also while i agree that they ruined him further i still believe not anyone can be with him, he is still quite wierd with his fetishes they just made him worse.