On a whim, he would use any means to trap her into a golden cage.
But if a beam of light is imprisoned, it will only become dimmer.
After she escaped, he learned how to love people - from paranoid possession to restrained protection; from "you can only be mine" to "I just want you to really smile at me once."
True love never puts light in a cage, but is willing to wait for it to illuminate itself willingly.