Hello Friendly, I am Green...
I am sorry to hear about your flytraps. I had trouble keeping them alive at first too. Mine sometimes look dead in winter but they come back in string.

There are three ways to kill Venus Flytraps. Play with the traps all day -or- give them tap water (they need distilled) -or- expose them to regular soil (even rain splashing from the plant next to it.)

The opposite keeps them alive: moss, distilled water, and let them catch their own food. TBH; Mine do very well although they never get any direct sunlight. There are lots of bugs and spiders in my garden = so that is important too. Thanks