You are doing great Phoebe
You became aware that there was something wrong.
You made the big step of posting on here - reaching out for guidance and support.
You have listened and taken advice.
You have now implemented an escape strategy by the room at your Mums and telling people in RL. Keep doing this. Keep involving them. Show them this thread.
You are back here posting, reaching out for support again. This is brilliant.
Now for phase 2.
All of the new incidents you have posted are just white noise - the details are irrelevant as they are “just” the actions of a v dangerous abusive controlling man. Coercive control is a crime. You can collect evidence, approach the police and have him arrested.
The big picture is he a v angry man and you are his whipping boy - NOTHING you do will ever be right because he is just spewing out all of his internal anger on to you. His anger has nothing to do with you - it will be some childhood issue and it will never abate or be satisfied. The master bedroom / spare room nonsense shows you this.
He could get nastier and more dangerous now. So cards close to chest and poker face.
I would leave immediately without him knowing. Get essentials (key docs) out of the house - a little each day. I would take all of YOUR money from the joint account.
I would get legal advice about how to sell the house in this difficult situation (not unusual) and also around how no doubt he would have used coercive control and financial abuse to stitch you up over the deposit. His lawyer - his sister - was part of this - it would take 2 minutes for a court to reverse this set up to return your deposit and she may well face disciplinary / professional misconduct / striking off - so she will be motivated to comply and resolve this.
To do: get stuff out by stealth, leave, get legal advice, get mortgage company advice, put house up for sale, RL support, keep posting here, decide if you want to press criminal charges for coercive control.