FlytrapCare Carnivorous Plant Forums

Flytraps aren't houseplants. They cannot get enough light for long term health on even the sunniest windowsill. They can sometimes get enough to survive without artificial lighting, but not enough to live more than a couple of years.
They use sunlight to photosynthesize, and put much of that energy produced into carbohydrates that they store as starch in the rhizome for the next Springs new growth after dormancy. However, glass filters sunlight, and most modern glass has coatings or additives that further filter it. On a windowsill, they get enough light to photosynthesize, but only enough to produce more leaves to try to capture more light. They can divert almost no energy to fattening up the rhizome, so the plant slowly declines and passes.
If your temperatures are staying above freezing, put it outside in an area that gets direct morning sunlight and shade from about 10 on. You can slowly move it out into more sunlight as time goes on, but, even when it is sitting in the shade, it gets better light than on a windowsill.
If it happens to put up a flower stalk, cut it before it gets more than a couple of inches long. Those take too much energy to produce, and your stressed plant can't afford to divert that energy right now.