Luo Binghe does not like revealing the properties of his blood, and he doesn't know Janet well enough yet to trust her. "Yes.¹ I thought if I demonstrated my power, surely he would back down. Instead he mocked me, and confirmed my suspicions—that he'd pretended to be enamored with me only to gain benefit for himself."
It's not as though he cares about Claudius' opinion, but he hates being deceived, especially when he'd been—unguarded—with Claudius due to his attentions. Now, perhaps, it wouldn't anger him so much, because he is permitting himself to explore a new lifestyle. But Claudius flattered and flirted his way into a personal secret of Luo Binghe's, only to throw it back in Luo Binghe's face at the first opportunity, when Luo Binghe hadn't even hurt him yet. "It's—you see—I could have forgiven the deception. But what he said... So I continued to torment him with my powers a little longer until I showed mercy. By that point, naturally, our relationship was unsalvageable. And he still hasn't apologized." Not even after... But Luo Binghe has resolved never to think about it again.
¹Unfortunately for Janet, he is pleased by the ego boost.
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It's not as though he cares about Claudius' opinion, but he hates being deceived, especially when he'd been—unguarded—with Claudius due to his attentions. Now, perhaps, it wouldn't anger him so much, because he is permitting himself to explore a new lifestyle. But Claudius flattered and flirted his way into a personal secret of Luo Binghe's, only to throw it back in Luo Binghe's face at the first opportunity, when Luo Binghe hadn't even hurt him yet. "It's—you see—I could have forgiven the deception. But what he said... So I continued to torment him with my powers a little longer until I showed mercy. By that point, naturally, our relationship was unsalvageable. And he still hasn't apologized." Not even after... But Luo Binghe has resolved never to think about it again.
¹Unfortunately for Janet, he is pleased by the ego boost.