You experience it physically… “gut wrenching,” “backstabbing,” “heart breaking.”
Internal organs bound and choked by queasy, bile-inducing intestinal cords of emotional anguish.
Physically healthy. Soul sick.
Of all the people in the world, how could a close friend give you less respect than a total stranger?
Year of the Book 
I know, right?It’s the worst type of betrayal one can experience,in my opinion.I wrote a piece about it.
https://wanderingviolet.wordpress.com/2015/01/19/she-is-not-my-friend/
Hope things get better…or at least you get a new roommate!
Oh I sure hope so.
Thank you for your concern. 🙂