You are past the point of standing up to her CB and "fighting" for her. She's living with another man her ex.

You can show her you are stable by letting her go. That would be you leading instead of pursuing. She's a mess and can't stand the thought of being with a man that would chase her to where she is now. If you really love her then let her come to you.

Or you can keep doing what you are doing.

M22,H45,W45 S21/18D12
Retain faith that you will prevail in the end, regardless of the difficulties and at the same time confront the most brutal facts of your current reality, whatever they might be.