You should definately protect yourself so that you are assured of getting your half of the assets. She sounds like she wants to have it all?? My understanding is that being formally separated (I would think a solicitor/lawyer would be able to give you all the details) would ensure that your finances become seperated legally.
Also, if I were you, I would definately not move out. It may put you in the position of having to fight to get her out or to sell.
Please take the time to get yourself a good lawyer. It will be an investment in your future and your peace of mind.
I am so sorry for what you are going through.
kind regards
wildfell