My attitude is that I'm open to her if she becomes open and willing for us to go get the professional help we would need to get moving again. My thinking is that I made a commitment to support her and do what is required, and will do that if she wants, and will remain married and give her space until she completes the D proceedings or, by some off-chance, decides to return.
With no contact, it's actually gotten easier for me to detach and try to prepare for the D while still remaining open to her if she decides to open up a bit.