Honestly, as much as it's great that all the adults in this manga seem like really capable adults who are actually taking action, and it's extremely refreshing to see that because almost every bullying and abuse focused mangas always have the absolute worst adults. However, I don't think I'll honestly be satisfied unless the NTR protag wannabe dies a dogs death, suffering till his last breath. Preferably by one of the girls he manipulated because that would be poetic. That, or he goes to prison and gets sodomized regularly by burly prisoners.
For the dumbass cheating bitch, she needs to get nothing but constant shaming from everyone around her to the absolute end and she lives in nothing but complete misery. Alone and hated even by her own family, till the day she dies or kills herself. There is absolutely no forgiveness for people who not only cheat on their partners, but on top of that make false accusations of abuse or rape against the person that they cheated on.