If it is a lily, then you can cut the stems back, but not the leaves - let them die back naturally to allow the nutrients to go back into the bulb so that it flowers again next year..

I'd like to see a photo of your plant though, to know what it was, to be sure of giving you the right advice - over here, lilies normally flower in the summer, with one stem per bulb.

Could it be an amaryllis - google it and see - it is hard to get them to grow again next season.