The reason we all love dark romance, is because we know the men in that world. So surrounded By darkness. They could Take a knife to any man that looked at her wrong. But would never, abandon her. Hurt her. Cheat on her. Or Break her.
There's nothing about the men in dark romance world that makes a man scary. Scary as in. You question if they are going to cheat, have a one night stand. Or leave the MC so heart broken. She cant leave her bathroom floor.