I could tell you that you should keep your PMA up. I could tell you that only YOU can feel like garbage. I could tell you to detach more. I could tell you to set boundaries.
But that would just be more of the same.
At best, you have a room mate who doesn't seem to respect you.
If she was just a room mate... not withstanding the reality that you have shared children and assets... just in this case, for a moment, set that aside...
What would you do if you had a room mate that you weren't getting along with?