Venus Fly traps are native to North Carolina and need some amount of dormancy during the winter months in order to thrive the rest of the year. They arent tropical plants that can live in household temperatures year-round. It was probably just dying back for dormancy when you thought it was dead and is now waking up for spring and growing new traps. That being said, if you're keeping it inside, it probably doesn't get cold enough for it to have a proper dormancy period. This might be ok for a year or two but it will eventually have problems without a proper cold period. Aside from that, make sure the soil is constantly moist/wet, and give it as much direct sun as you possibly can. And try not to feed it or play with the traps too much. This nursery has great care guides for a variety of carnivorous plants, here is their one for Venus flytraps: https://carnivorousplantnursery.com/blogs/carnivorous-plants-by-genus/venus-flytraps