You'd be better off speaking with a local NY agent .
Some landlords may be more lenient than others. If your income doesn't qualify you for the rent, you might be asked to have a co-signer. There are several possibilities.
Some landlords in NYC (not sure where you're looking to rent in NY) require the tenant to show an income of 40 times the monthly rent......some may not have that requirement.
Since your fiancee was working off the books, that doesn't help, so only your income may be considered.