I doubt you would save money by moving out, given that presumably your accommodation is in effect cashless. And prob not sensible to take DCs out if their home until you have to, unless e threatens violence. Home and security ate very wound up together. V difficult to understand if home is lying empty and you're not living in it. Once it's sold, no problem.
On another thought, now he's gone can you get in touch with both sets of GPs and arrange to see them? Nice for both sides, if not for you, and makes the point that you are not unreasonable and not cutting off contact.
Finally, have you proof that you gave at least asked once why he has refused to provide more money and you have asked to see the financial ins and outs, all the family income and expenditure, assets and liabilities? If not, it could be that he had huge debts that he brought into your partnership accumulated before you got together and is actually not able to provide more without the heavy mob being on him. Or that he has done so since you got together. If you have asked and he has refused to disclose and you have an audit trail as proof of that, then you are in an even stronger position. Don't forget, it's not uncommon for people to try to hide assets/income.
Sorry if this sounds clinical, just trying to help you think through your positioning.