My former college roommate/ex-best friend was a controller. She controls every aspect of her BF's life. And she tried to control every aspect of my life as well. She even tried to control/change the way I feel about my own BF.
I stood up to her, and she resented me for it and refused to talk to me when we were in our room together. Eventually she moved into her BF's room, who was rooming with my BF, and tried to control that situation too.
Long story short, it was a huge disaster and
we are no longer friends. I am much better off though!