Uh oh...I'm in your ear? Now you're in trouble. LOL!
Yea, Im thinking that she is telling you about the dating stories because you told her you would be willing to work on things.
They want to be heard. When you tell her those things, she feels she isnt being heard.
Even though you dont agree with her, and even though she may not be sure what she wants, the thing is that she is saying she doesnt want the marriage right now.
When you make changes and move forward and let go, it means you've heard her. When you dont bring up working on it, it means you've heard her.
Trust me when I tell you she knows how you feel. But when they feel you hanging on, they try to shake you off. The more you hang on, the harder they shake.
I agree with your boundary about not hearing those stories. Dont keep saying it. Just dont respond. She will get the message. As long as you respond, she has your attention, which she feeds off of. Leave her to her ridiculousness.