Mind reading, but it seems like my new stance may have renewed her intent for D. She hadn't mentioned anything about it for a couple of weeks. Either way, I needed to set these boundaries moving forward, regardless of the outcome.
Yes, you're mindreading. She could be bluffing, or she may have had all these things in the works anyway, who knows. The bottom line is (and you immediately recognized it yourself) either you could have lived with this (open marriage, deceit, disrespect) or you couldn't. It either violated your core boundaries of personal integrity, or it didn't. So you really had nothing to lose to taking a strong stance, because her continued infidelity isn't something you could have abided anyway.