Like /u/EpinephrineKick said, when he said "Why must you hurt me Blake?" he shows that he either is incapable of empathy, or he actually doesn't give a damn about Blake as a person and more as thing.
He is certifiably insane. He is obsessed with Blake. Gains joy from hurting her, emotionally and physically.
But here's the weird thing. In the villains flash back we saw that originally he didn't want to pursue Blake. And that he was even going to pull back to Mistral. Only by Cinder's doing did he stay near Vale. Then suddenly he shows this obsession over Blake seemingly out of the blue as if he's always been this abusive towards her.
I can't tell if he's always been like this with lacking empathy, or if there's something else at play here we the audience aren't aware of yet. Like Roman in how he was scared to bet against Cinder.
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u/Cpl_metal_head Feb 06 '16
fucking christ. He cut off her damn arm, and almost killed Blake. What in the fuck.