Quit using those joint accounts ASAP.
My ex emptied the joint account days after our split even though he knew that was the only money I had access to. I too was incredibly naive and trusting, was a sahm at the time with no income of my own and only that joint account, it was a nightmare sorting out a new account, having to borrow from people just to feed dd and I until I organised tax credits and got a job and nursery place for dd.
He also took the family car without notice leaving me essentially stranded - he didn't even need the car!
I also caught him trying to take things from the family home when he wasn't expecting me to be there.
I've had friends & family with similar experiences - taking valuables and even cash from the family home, including jewellery and tech even furniture, vehicles, in one case a caravan, selling businesses from under them, emptying business accounts, running up debts in exes names etc.
So be careful!
Open a new sole bank account - with a DIFFERENT bank, preferably a different banking group (seriously I could tell you some tales!) altogether, ASAP.
Cancel any bills that are for things that were just for him ASAP.
Re big argument!
Wow! He really doesn't get it eh?!
You're being bloody generous letting him stay till Sunday, financially I'm not sure that's wise. Be sure and secure financial and legal paperwork of yours is out of the house! Keep your tech out of his reach too!
He's a real piece of work eh!
When he's gone change the locks, absolutely would not trust this guy to not "give" you his keys when he's had another set cut!
"His shiny real-asshole scales are glistening in the morning sun" love this 😂
On another thread recently someone said "you never know who someone really is until you divorce them" that is SO true
QueenCoconuts post made me wonder - is ow well off financially? That may be part of the interest for him if she is. Also if she is very religious and he's somehow made out he is too, perhaps put her straight on that, also in most religions unnecessary debt/spendthrift behaviour is sinful.