He wanted you to die slowly. He obviously enjoyed the idea of torturing you, seeing you in pain. Was it a control issue? You were reported dead but kept alive for his own pleasure, so at the minimum beatings, likely rape, electric shocks at varying voltages. Some degree of mutilation from your scars. Starving and sleep denial, any degree of psychological torment or humiliation while hurting you.

Am I close?

[Though his expression is almost a smile there's something empty and maybe cruel to it. But his gaze isn't really for Masaomi.]