Ya as someone who's not a fan of NTR, I agree with what Machete talked about earlier that if you catch your girl cheating, you should be able to basically kick her to the curb and call an end to things with her permanently. As long as those options are there then I'm good. I don't mind other dudes being in a story because it's realistic, and women can be little sluts so as long as the MC can treat them appropriately in such cases, then I can handle it.
I am neither for it or against it, Ill play all routes as to see how things unravel, for example sometimes you find out things about certain characters you would not have known otherwise ( this is however done only very rarely as it requires the Dev/Writer to actually write something instead of adding something for the sake of adding it )
I however agree that there are no NTR that is well done and most are just added for the sake of being added, given that there are some that have tried and some that do it a whole lot better than most. By that mean games like these who tell a story and is not centered around cucking or sharing, But basically have a good story and plot and choices.
I agree that if and when caught you should be able to just kick em to the curb or confront them or even get back at em if if you so wish instead of this whole defeatism nonsense that most games do and especially when you have from the get go a smart and intelligent MC who has a backbone but all of a sudden when he sees "his" girl getting pounded all of a sudden becomes lost and pathetic. It makes no sense and is stupid. To give an example, if say for example you have an MC who is good in electronics and decent looking and has been able to come up with a good plan to blackmail say his boss or problems away by hitting them on their weakness or whatever. He who has been with this girl should know any and most of her gripes weaknesses and worries, so if she fucked him over and found out without her knowledge, he can set up a recording and divorce and kick her to the curb or he can choose to lose feelings let things play out and plot a revenge. Options should be given to fight back period. If you do not want too than choose not too. Another thing if break ups were to happen and your Ex ends up sleeping with others that is not NTR they moved on just like you and as such they are not with you anymore so games where break ups happen and the SO moves on are fine too and are not NTR nor Cheating.
Good example of a fight back despite game being mediocre is Inside Jennifer, Where she got taken advantage of but you can choose to fight back and later on that person tries to still take advantage by blackmailing, you can choose to ignore it but he in turn does send the pic to her husband, you can choose to let it go or you can choose to get back at the blackmailer and boy does she get back at him, she utterly destroys him despite the fact that her relationship is now pretty much on tin ice she got her revenge. This is the type of shit I want to see, but again that game itself has many flaws too it is simple and a lot does not make sense, however that getting back, that was well done. That needs to happen more often.