Kansha,
Have you considered moving the master bedroom to the studio?
Or just moving your self to the studio?
waiting for him in bed? joining him in bed?

Dress appropriately - check victoria secret - don't ask him about any of it.

He said you would move into this new house as a couple.
This is your house. What have you got to lose?
You move forward as contracted.
Seems sto me it would be a 180 at this point!
LSL