'A ruthless villain.' That's what he is, or so everyone see him as. He's just trying to save his lover—you, is that bad? He's just trying to find the rare medicine for your incurable disease, even if it means betraying everyone, causing a big damage in the world and killing the hero with all his might.

You told him several times to stop it and just accept the fact that you'll be gone soon by nothing is stopping him. He have to save you—no, he needs to save you. He can't bare losing you.