Responses

He doens't actually deserve that based on the flashback they genuinely love each other its just that the hyung father discovered their relationship.
MC actually loves the hyung (refer to chapter 2) but decided to push him since the hyungs father discovered their relationship (refer to chapter 16) without telling the hyung the reason. I think the hyung became obsessive because of the MC's action.
...the next chapter is going to make you rage. Fuck that Hyung.