I think you should ask him directly if he still wants you to move in and if he says yes, you take the initiative and start cleaning out and organizing the room. If he stops you, you have your answer, if he doesn’t stop you, you also have your answer. Either way, you’ll know.
If both of you keep waiting for the other to say something or do something you will continue to be in limbo.
Bite the bullet and get an answer.