I agree setting boundaries is a waste of time. If she wants to cheat on you no matter what you do, nothing will stop her. Men should not chase relationships... the chick should be the one that is trying to lock you down. She has to bring this up... and when she does then you tell her ONE TIME, what you are willing to live with. You set the conditions of the relationship and if she ever goes against your wishes... you just dump her. At a bare minimum you should insist that she leave behind completely dudes she used to fvck... because we ALL know that the only reason a dude would be hanging around is to have another crack at her crack.
This is the key... when she is ready to move on, she'll just stop trying to keep you, meaning the relationship rules don't matter to her. So this just makes it easy for both of you. As soon as you notice she's violating the conditions of the agreement, then you get to be the bad guy and dump her. This way you don't have to suffer through all the BS of her getting b!tchy in an attempt to drive you off. It's best for both of you. You don't set 'boundaries' in an attempt to keep her, you set boundaries so that you have no doubt things are done, and the ONLY time you do this is when she wants a relationship and never try to enforce boundaries, don't argue with her because it's a waste of time, you just let her know where the line is so that you know when it's over.
I was going to say I'm still on the fence, but I can see why you need to tell her once as you say. The reason why is there's risk on both sides.
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If you never tell her at all, there's the risk she may really think it's fine to keep exes and orbiters around, and you could lose an otherwise interested and relatively respectful woman
because she was being submissive and following your lead.
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But if you do tell her, there's the risk that all you really accomplished was showing your hand to her and potentially made things worse for yourself, when she was going to be as respectful and loyal as her interest level anyway.
Can't win if you don't play I guess. You take a risk whatever you do or don't do. But I can see why you'd advocate for taking risk #2 and not #1. Plus, I find they usually can't hide their real selves forever. What they are really thinking and feeling will come out. Like you said, she knew what was a deal breaker and she still did it, and if you've told her once then there is no uncertainty on your part that she genuinely "didn't know". Still have reservations because of risk #2 and the fact you should be able to tell by her behavior what her interest level is anyway, so I'm not sold... but again there's risk no matter what.
In the end I guess you'd have to determine this on a case by case basis with the woman, as I recall you saying when we talked about "disgust" (which in the context you used it, I might term "defiance").