Your wife's comment reminded me of how I would phrase things.
W: Part of me wants to file for divorce so you can be at peace and off of this ride I have you on. You deserve to not be put through this. Just my opinion. Not wanting a deep conversation just my thought right now.
When I would say something like that, I had multiple realized and subconscious meanings.
I'm not worth your time and effort. I'm sacrificing what's important to me without knowing it. It's easier to let go than fight for what scares me. Please read my mind and help me.
The only one who can fix her is her. I'm changing positively as I'm being forced to learn basic truths. No one can do that for me except.. me! You're a great source of emotional support and consistency. Be the anchor as she finds her way. Learning you have two feet and can stand on them takes time. Building confidence is what gives her strength to grow.