The kind of love that exists when someone lets their fear guide the way they love someone.
The Feeling of Dark Love:
You don't want to love the person you love, but you can't help it, and that makes you hate them. And the the relationship has to remain mysterious because there are things that they can never know about each other because it would make them love each other more. And the deeper in love they are with someone, the more it will hurt in the long run if the thin line between mystery and knowledge/love and hate is broken.