Hey sorry about your betta:( Did you considerate to rescue another one? Do not get discourage please , it is happens to everyone and it is expected to be because bettas get sick as much as we do. Please let me know if you need any help. I can give a few hints on betta care . And if you will go to buy another one make sure you check new betta for any signs of the disease . If you need my help write in my mess box or you can send me pm. Good luck!