Su-ah emotional state isn't Juhyeok responsibility. If a person push you out consistently ever since you guys were little and you yourself actively still bother them then how would it ever be the friend fault for you not listening and moving on from that relationship especially when the friend pushed you out since like primary until you're reaching uni and the only reason he needed that cum is because of su&ah to begin with. People infact has the rights to cut people off whether it them coming to hate the other person or their own issues. There is a clear preparator here. Let's get straight

Idk how to say it. Su Ah is wrong by conditioning juhyeok's body in the first place, and it was non-con, it made juhyeok unconsciously need su ah, when he didn't want to.
But I kinda understand the reason behind su ah. Juhyeok suddenly flipped the switch, when he presented as omega and su ah as alpha. But it was juhyeok own projection. I also understand it must be devastating because it's not like how he imagined, but he cut off someone out of his life just because of gender.
And then he used su ah as cum machine. I really think su ah is pervert and not in his right mind.
Both characters are mess up I guess. I don't think the relationship is anywhere near green flag or normal.