when should i stop using my steroid eye drops?

I had a cornea erosion problem due to my dry eyes. My doctor put me on the steroid eye drop, zylet 3weeks ago. I used it for a week and a half and stopped since my dry eyes were gone. However, after a week, it came back, and i resumed the steroid. However, i was wondering if it was harmful over a 1month period, and if it was wrong of me to stop so soon. I put a drop in each eye once a day.