I have never had good luck growing a Boston Fern. Two years ago I saw some small Boston Ferns in 8" pots in my local Home Depot's plant area priced at only $8.00 each. So I came home with three of them.
At the time I was living in a three story house on the water in Homosassa, Florida with lots of ocean breezes mixed with a long summer rainy season. I wanted these ferns for my second story wrap-around deck, where I would enjoy them through my many windows in the living room and dining room areas.
The inside fern continued to grow and flourish. When I moved to a different house in May of this year, I was worried about my inside fern as this house has no east windows for morning sunlight. So I put my big fern right inside my two sliding glass doors that face the west, where it now gets the afternoon sunshine and light.
This inside fern seems happy here and continues to grow and get thicker. Yes, a few leaves do fall from the underneath side close to the pot, but that is normal. I continue to keep it watered from the bottom, and fertilize it once every two or three months. The two other ferns are outside on my front porch facing the east and doing well, but much smaller than this inside fern.
I hope I have encouraged you to try growing a Boston Fern! Good luck and don't give up!