I can't recall if you've said what your family is like... but can you move back in with someone in your family? You have nothing holding you to him or the city you're living in - you said that in 3 years you haven't made any friends, and you're not working... so.... it sounds like it's time to find a family member who is able to help you out at least in the short term.

It is actually reasonable to want to be financially indepedent from a bf/gf; he is supporting you financially 100% and it would make sense for someone to become upset/resentful for that (honestly, I would never support someone to that extent unless we were basically married and something happened.... I would never start a relationship where I would be paying for them for everything...).

HOWEVER. He's already shown that he's abusive. He is using this threat to control you more. He chose to support you financially as I'm sure he was aware of your situation before you moved in with him. By threatening to take that all away from you in such a short time span he's being incredibly cruel, intentionally. It's designed to make you scared and cling to him even further. When he's nice to you after, it's just a way to reinforce the self-blame that he expects you to have, and he probably figures that he can easily be nice as he's getting what he wants - you being scared, submissive, and depedent.

I'm so sorry that you're in such a horrible bind!