An ex-girlfriend has suddenly contacted me recently stating she will take legal action against $3300 that I owe her for rent. This happened about 5-6 years ago in New York City. No official lease was signed by me and I don't remember the details of the money I owed her. I am a 3rd year medical school student with a family, with a premature baby in the neonatal intensive care unit and have $200K in school loans. How should I proceed? Thank you.