How to deal with the death of a pet?

Few years ago my father brought home a fledgling. He was not supposed to remove from the ground as usually the mother leaves it there so it can learn flying. i had zero idea what species it was and how to take care of it. I googled and took him to a pet store who didn't help me. I fed him the wrong type of food instead of worms i fed him fruits and formula. He fell from my hand once to the ground. The bird survived 1 week then died. I found his head slumped down and i was traumatised by that. I loved that bird and i can't forgot how he trusted me to handle him over everyone in the house as if he hoped i save him. Years later and i still feel horrible. Any advice how to deal with that?

How to deal with the death of a pet?
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