Its poor writing, pacing and DEV has no idea what to do. It is suppose to be cuckold, meaning that the MC catches the main girl and the bully together, while they are aware that MC knows. This usually occur in the early mid stages of most NTR story, and MC tries to win the main girl back. MC doesn't necessarily have to like or hate it. MC can get hard, cry, mad or whatever. He just have to get cucked. In the long games MC loses the girl to the bully and will either accept or reject the outcome. If MC accept his cuck, he become submissive to main girl and bully usually ends up watching them bang, being told what to do and being treated poorly. If MC rejects, the main girl leaves to go live with the bully, or the main girl kicks the MC out and invites the bully to come lives with her, and they continue to bang. They may send a video, email or stream of them banging to the MC or completely cut ties with him.
"On side note, cheating is where the MC is unaware the main girl is cheating behind his back. It will ultimately leaves down the same kind of end but it occurs towards near the very end before MC finds out. Usually there no accepting or rejecting the outcome, just the main girl leaving with the bully or if main girl is the power couple she kicks out the MC and invites the bully. They may send a video, email or stream of them banging to the MC or completely cut ties with him."
"Second side note., blackmail is where the main girl , MC, or both is being extorted and main girl gives herself up to cover up the extortion. If only main girl is extort it will have cheating elements. If MC is only aware, it will have cuckold elements. If both are aware, its both elements. This can occur as early as the beginning and will ultimately leaves down the same kind of end. Usually there no accepting or rejecting the outcome, just the main girl leaving with the bully because he is rich.
Dev is too ambitious in this update and add category outside the NTR like one known as "SWINGING." meaning couples are okay with having consensual sex with others. This is not really cuckold, its open relationship. There is also other category such as gangbang, prostituting, incest, multiple protagonist, multiple antagonist, and even blackmail. It become too messy and the original CUCKOLD plot is lost. It almost feels like a completely different game and story from previous chapter to be honest.