Venus fly traps (VFT) have 3 little trigger hairs on the inside of each trap, if you look closely you will see them. Any two hairs brushed within 2 seconds will trigger the trap to close and each trap only re-opens 3 times, after which it dies. The traps are just leaves so it is only the leaf that dies but of course if you kill all the leaves then the plant dies. I would suggest you don't feed the plant that often, maybe only 1 leaf and when that has digested it's prey feed another one, they don't need that much food.
I would also expect that a meal worm is LOT for a VFT to eat, they get by on flies and much smaller things and, as has already been pointed out, putting something overly large i the trap will cause it to rot.
The other thing to be aware of is that VFT's grow from a central (small) tuber and in nature experience a fairly cold winter during which time they naturally go dormant for around 4 to 6 months. They need this period of dormancy to survive and if they don't get it they will gradually get weaker and die regardless of how well they are looked after.
Cheers, Troy