1. She started to cheat on him willingly, NTR guy didn't rape her, at most, he was a little too persistent at the first scene, but eventually, she asked him to have sex by herself.
2. The detective was just a nice guy and not "hidden mastermind" like you would expect from this genre, lol.
3. In the end, MC didn't accept her in any of the endings, discarding her as a slut she was.
4. Even after that she still wanted to keep relationships with him and tried to lie her way out of the situation. xD
5. I liked the hidden ending in which the wife became a prostitute after the divorce and MC fucked her without emotional attachment. (it isn't easy to get - you can just check a walkthrough or get a save, it is the last h-scene)