I am sorry for your situation.  But you appear to have no ownership rights in the condo.  There is no such thing as "palimony" in Illinois.  What is your is yours and what is hers is hers, unless you guys have a written agreement that states otherwise and  how things are to be divided in the event of a break-up.  You are considered at best a renter here and she can evict you to get you out.  Illinois also does not have common law marriages so that avenue is not open for you to pursue (and you state point blank that you do not hold yourself out as married anyway here, which is a requirement).  Good luck to you.