How do you get a man to help pay your rent I’ve brought it up but he doesn’t seem to comprehend

I think by him knowing my finances he doesn’t think I need help but I’m not able to save money or do anything extra outside of my bills he pays the phone bill and internet which is $120 each month for both. I receive 1200 each month my rent is $300 I have a washer and dryer bill of 125 each month I have other things I need to pay that takes the rest of my money and here he gets to buy car parts and maybe buy little household needs that I need each month but I don’t feel it’s enough. He does side jobs and don’t work but he has hundreds of dollars every now and then all he does with his money is take it and fix his car to sell it. But I just don’t want to be wrong thinking or overthinking it What should I do ?