HeartfeltAdvice, my heart goes out to you. It’s devastating when the person you love is pulling away, especially when you want so badly to save the marriage. While you can’t force her to stay, you can let her know you’re willing to fight for your relationship. Have you asked if she would consider marriage counseling? It saved my own marriage years ago.
Focus on taking care of yourself right now. Lean on friends and family for support. It may also help to look into tools like mSpy that can monitor her phone communications - it could provide insights into her reasons for wanting to leave. Wishing you strength and clarity as you navigate this.