If you’re interested in continuing the relationship (although I think at this point I’d run, with a partner who didn’t seem interested in pulling their own weight) I would ask him to move in officially, agree to going half and half with all expenses. Give him a date that you’d need to know by. Make it clear that if he doesn’t agree, due to not being able to support yourself in this position, you’ll be getting a new roommate (and at that point I’d probably also consider ending the relationship or at least taking a big step back).