Remember... Tigerlilly, Paul, and all our future fish friends could have died alone in a cold cup in a pet store, or suffered far more painful fates. These fish are tough and can survive through a lot, but of course we try our best to give them the best homes possible.
And sometimes deaths happen. I only had Dionysus for 1 year before he died, and he had a 5 gallon heated, cycled, filtered tank... I did everything by the book..he still died very young. They are fragile sometimes. Sometimes it's not our fault when something goes wrong.
I'm sure he was happy to be in his home, no matter what it was. He got food(even if sometimes he got too much), he had a place to swim other than a cup, and he had someone who loved him. You were learning at the time. We all make mistakes. We fail sometimes.. But we learn from what happened, and then we can give our next friends even better lives!
I'm sorry your uncle was angry with you. People respond to deaths differently.. I cried the most in the moment's before Dionysus's death. I could see his suffering, it was so terrible. But when he was gone I knew he was at peace. I felt sad, sort of hollow..but more at peace.
Tigerlily of course would forgive you. He doesn't feel pain anymore, his little fishy soul is at rest. He survived an important year by your side, and I'm sure you'll never forget the time you had together, even if it was a long time ago. We know our fish have short lives, so instead..cherish what you learned from him, and the joy you had from caring for him. He probably was a big influence in leading you to this site! And that alone has helped you now and will continue to help other fish get amazing homes!
You sound like a really loving owner, and that's what matters!