In your situation, I think it's fair to pay for your shared expenses proportionate to your income. If he makes twice as much, he should pay twice as much. And then any other personal expenses you pay out of your own money that's left over. You can't control your shared electric bill or shared rent or whatever, but you can control your petrol use, car payments, gym membership, etc. Unfortunately, this would include your debt as it's yours really and I wouldn't necessarily consider it his responsibility. But certainly if he is making considerably more, he should pay more of the shared costs of living together, rent/mortgage, food costs, utility bills, etc. Then what you send on other things though is up to both of you. That means you're still responsible for your own debt, but it should free you up to have a bit more money left over after.
So my dh and I make about the same really, but we share rent, food, utility bills, child-related costs (including childcare when we needed it), more periodic expenses like heating oil, house repairs, etc. But then we each manage and pay for our own cars, petrol, commuting expenses, any incidentals like a meal out or drinks or just little expenses, he pays for his own student loan, etc. Now I'm going on mat leave, so he'll make considerably more than me though, so he will carry on paying the rent and I'll just contribute to other shared expenses, plus my own petrol, car, etc.
But in reality, if you are a partnership, neither of you should be destitute while the other has loads, as long as whoever is running out of money is generally financially responsible. If my dh or I ever get low in a given month, the other sends some money their way to keep them afloat. That works for both of us, but we also aren't ever running out because we're blowing it on something stupid. It's usually like unexpected expenses, like car repairs, or a cut in pay because one of us had to take some time off or something.