He likes to be degraded an d get emotionally abused. Her not loving him and showing interest in others but him turns him on. However he wants her to be cold hearted and al alpha female as well, which she is. In other words as soon as she begins to care for him, he will loose interest in her.
Which in a sense I can relate to, all the people who have shown interest in me is actually a turn off, while people that make it hard and belittle my feelings makes me swoon (yes I'm a creep and I don't know where this comes from hahah), but as soon as they return my feelings within the week I loose interest.
ALSO Im for either Shouma or the ML. HOWEVER I would love to say that I LOVE our ML, this story isn't meant for vanilla readers and having an antagonist as charismatic as him makes me swoon. Either way whoever she ends up with I'll love it, I just hope she keeps torturing the ML for much longer.