It appears I have driven her back into "the tunnel."
The short answer to this will be guilt. If she loves you she will feel guilt over what happened in the past ( her actions ) . If she doesnt feel she loves you , she will feel guilt that she doesnt etc. She doesnt know how to respond in a way that either dosnt make her look bad or that wont hurt your feelings.
In my opinion you are too focused on her and each response. She is on the rollercoaster and you are riding along in the car behind . Its time for you to step off and watch from the platform. Concentrate on your actions and life , you can do this and still care. When she has an unreasonable hissy fit , take the attitude " frankly my dear , I don't give a dam " . Lead the way , dont follow , take control of your life .
I will tell you one thing . If and when you decide to date the wheels are going to fall off her trolley. My wife who once described our M as a sham , had 2 affairs , since leaving ( a year and a half ago ) has had at least 2 BF's has been angry for 2 weeks because I had another woman ( attractive one at that ) in the car when I dropped D off a couple of weeks back. Said Woman is not a romantic friend either.