Thank you Kind18, Ready2Change, BL4, SteveLW and Valeska. I think yes, seeking advice from a lawyer will the best immediate course of action. I have made an appointment and will see them Friday.
I have set up my own checking account (and an extra savings account) and I transferred what I have calculated to be my contribution (which is like 85%) from any joint accounts we have. I can back every single penny from transfers I made or from my tax returns or my salary, just in case he gets fussy about this during actual D. In fact, he rarely ever contribute to our accounts at all. Other than that I will consult lawyer when I see them.
I have also organised for my salary to be paid to my individual account. Although my HR still says it might take time until the new account is processed in their system, but at least measures are already in place.