IMHO, this is the best thing that could have happened with respect to your M having a chance.
You posts lately have been very troubling. Your hope seems pinned on circumstances conspiring to force W back into your home.
For your M to have a chance of being a healthy M, your W needs space to make the CHOICE to move home because it is what she WANTS. FIL has helped giver her that space.
As far as D sleeping on a bed that USED TO belong to OM, I would say that is a mark of how unsentimenally your W views that bed. If she thought of it as her lover's bed, she would hardly earmark it for D.
Your volatility here also suggests that both of you need some space to figure out what you really want.
FIL's actions do not sound like a slap in the face to me. Rather, they sound like the actions of a man who genuinely has your and W's best interest in mind. No father would want his W to feel coerced into returning to an M in which she had not been happy. No father would want to see his son with a woman who was with him merely out of a lack of someplace else to go.
