What a pitiful relationship. A fucked up, psychotic meat mangler and a relatively normal girl choosing path to hell for the meat mangler
The crazy dude is born that way, and his actions are not really under his control. Its not like he can really do anything about it.
As the caretaker, his partner should have controlled his actions completely but she was unsuccessful. Now she is an enabler, letting others and herself suffer for love, fighting through guilt and madness.
There can be no redemption for them, but I still feel sympathy for the relationship they have.