I agree with DG. You are definitely in LRT territory. You have at least two of the qualifying criteria for using the LRT - the physical separation and her stating she wants to D on no uncertain terms. It sounds like you already have some pieces of the LRT in play right now by default.
Start working hard on yourself. This is for your mental health as well as an attempt to save your M.
Your W is in an irrational state of mind. She needs to go on her journey right now while you work on yourself. Be the person only a fool would leave.
A lot can change in a few weeks. Keep your head up.
I've been trying to put some of the LRT in place like trying to let her come to me and trying to remain confident but honestly I feel like it's tearing me apart and I think she senses that despite how I act. maybe that's why she keeps switching gears on me? to shake me up? It's just so hard trying to be happy when I'm in so much pain over this.