So my main character is an immortal being and a super villain he's obsessed with his arch nemesis and she has no idea why. His obsession is based on that she in a past life used and manipulated him by pretending to love him so he's torn between wanting her in a romantic sense and wanting to kill her a second time. Which is why by day he's her boyfriend and by night he's her worst enemy. He doesn't even understand why he's unnable to decide between his feelings. As her boyfriend she knows him as this classic white knight who is just always perfect and charming but his villain persona is a Christian Grey womanizer bad boy who runs a chain of fetish clubs and is the king of porn which is a front for his evil shadow organization. Literally everything she stands against he stands for. My only problem is I'm afraid he wont be well received because he's obsessive, controlling, violent(not with her but others), and he makes Christian Grey look like a choir boy. My only problem is I don't know how to make the romance genuine because he's so twisted and so much of a stalker that it may be impossible.