Some words were missing from you initial post, but I hope it said that W moved into the guest br? Do not make the path smooth for her by moving out of the br or house. My H tried to pull that stunt (moved my stuff into guest br while I was gone) and I told him he'd better have it turned around before I got back. He even tried to present it as having 'made it up so nice for me'!
M 16 yrs, WH62, P54 3 adult blended kids EA 11/13, BD1 6/14 PA fall 14, BD2 2/15 Piecing 2015, BD3 12/15 Separated 4/16 WH moved OW in 5/16 Divorced 6/15/17