What comes to mind is the possibility that he absorbs the full cost of the rent—he is capable of doing this as he just got a good job and makes three times what I make. He was going to make the move even before we thought of marriage, he was planning to do this for his daughter anyway, and he would have gotten the same size apartment we are in now . This arrangement would help me to pay for gas and save money that would allow me to pay for self-care services.
Be honest with him about why you think this is a fair arrangement, based on your income and new expenses because of the move, along with needing more money for self-care. He’ll most likely agree, and if not, you can remind him that while you did agree to the move, you did not realize that your income would not keep up with the additional expenses of living there, and you would like some additional support to help you be your best self.
There’s a huge relief with paying off all your debt, beyond the interest savings. You feel better - which makes you much happier than buying stuff you probably don’t really need on credit.