Quote: I fear our marriage, no matter how good it is, will never be good enough for you, and neither will I.
She made everything you said about how YOU were feeling into something about her. In her mind, she sees the glass as half -full, and you see life as the glass half-empty, and if you could only adjust your view of things, wouldn't life be grand. This isn't about her being good enough, or her part of the marriage being good enough.
Again. A comparison. She cannot stay OUT of your shiit, and that is the problem. If she could, she would have responded in a manner akin to:
HD: It sounds like you are in a difficult place. How can we work together so that we can both be in a good place?