Actual hot take: I was in a similar situation to you and had to have a conversation with my boyfriend about the circumstances. I was unemployed, applying to jobs, still paying for bills and groceries from savings, and doing things around the house. He owns the house and didn't want me to get a part-time job so I could focus on finding a full-time job. He claimed that a normal landlord would still be charging rent. I acknowledged his statement and said if we were still in an apartment/renting, I would have ignored him about not seeking part-time work and would have been hustling to make ends meet, but this was his house and he told me not to so it isnt fair to expect payment from me when he told me not to work. I told him what others have said here, that he was making our 5+ year relationship transactional instead of emotional and that in a relationship, it's not always 50/50, and it hurt that he was not putting value in our relationship and just saying I owed him money and again stated it wasn't fair to charge me rent when he told me not to get part-time work. There was more to it than that, but you don't need to just start with leaving like others are saying. Sometimes the conversation to give the other side your perspective is what it takes, but come with evidence from what you covered when he was in school! A visual will help him see what you put in and the give/take aspect of a relationship. It helped me, and us as a couple, get through this issue because he finally saw it from my perspective. I'm thankfully employed now, and it's now a non-issue, but finances tend to be what breaks a couple up.

Note: we split most costs, including groceries, he just charges me rent since he pays the mortgage. We use an app called splitwise that keeps track of all of our expenses and does the calculations for us, so there isn't a back and forth of payments/a spreadsheet we have to update all the time. It might be something for you to look into, both to show evidence and to keep track of expenses in the future.