Biggest mistake was in having these conversations.
Her: "Can we talk?" You: "Has anything changed?" Her: "Not really." You: "In that case there is nothing new to be said."
If she tricks you by answering "Yes, something has changed." Then end the conversation as quickly as you can, with "I am sorry, I am not understanding that anything has changed. I've already said what I have to say. Sorry but I am busy, I need to take care of some things."
Do this friendly. Without even a HINT of anger or frustration. I get the impression that you continue to engage her with frustration and anger. Maybe you aren't but reading your update it feels that way. Your goal is to remain stoic. Show no emotion. You aren't happy about the things discussed but neither are you upset. I know that scares you because she has complained about your lack of showing emotion, but she is in an open affair. So so what. If and when she commits back then you can show her ho wonderful you've become with expressing emotion. Not until.
As far as her being upset. SO WHAT! Again, this should not affect you. Stoic. Again, that doesn't mean angry or frustration. Or being unkind. But you are like a rock. She kicks you emotionally you don't even move. The goal here is to show her she no longer has control of your reactions and emotions. And she WILL test that.
I like your response on the apartments. Now stick to it.
M(53), W(54),D(19) M-23, T-25 Bomb Drop - Dec.23, 2017 Ring and Piecing since March 2018