It all depends where you are located and the laws there as well as your age. Usually you would become a ward of the state at this point.
The best and most accurate information available is at the ICE (formerly INS) Now it's called USCIS.
Leaving your things in the old place doesn't mean you will be met with open arms. For all you know your ex could have given your things away. Still, there is always hope and perhaps your ex is waiting for you to come and get your belongings in hopes you may stay. Communication is so important, so give it a shot and phone your ex and be nice! Ask if it's OK if you come over as you still have some of your things there. If your ex sounds OK with this and pleasant to you then perhaps add, "Perhaps we could talk? Do you feel up to it?" This will give you some idea of where your ex is coming from. Good luck Marcy
I'm perty sure that you could b-cuz #1 you'r over 18 and #2 She is your immediate family. (:FireBrand:)