In that case, I'm trully sorry you've been betrayed by a friend.
You don't have to worry about your work, they have gotten to know you and know how valuable you are as an employee.
If you prefer to avoid confrontation then the best thing you can do is to slowly distance yourself and request a room change. Who knows? Someone might be wanting to change rooms and you'll be able to trade. It happened at my university all the time. And if you don't find a new assignment this year you'll be in line for one for next semester.
As for not having friends close to you, I can relate. All my non-forum friends are states away and we only speak on the phone when our schedules allow it. The only friend I made since I moved to Texas 2 years ago was a coworker and he just changed divisions so we only get to text.
Good luck Jackie and keep your head up.