If only Lumian had taken the courage to help him during those times he was getting violated and abused by an outsider, perhaps Valentine would have been a better version of himself. Not this broken boy being controlled and haunted by his trauma.
"I'm sorry…I'm really sorry, Val. It is all my fault, and I know that I can never make it up to you or atone for my sins." Even though he was aware that Valentine could not hear him, it didn't stop him from talking. "I should have kept you safe and looked out for you as an older brother should. I should have protected you no matter what it cost me, but...I was a fucking coward."
"It'd hurt to see all those awful things being done to you, but I was really afraid, so I couldn't do anything. I could only beg my father to stop that woman, but he wouldn't listen to me. He wasn't willing to stop because it would cost him what he sought."