I am so sorry for your loss and your pain, dear!!!! *big hug*
Don't give up on your dream of bees, it may just take a different path now and a little longer.
I'm sure you did nothing wrong and it was just one of those things, sometimes animals just die.
Try to remember that you gave him a wonderful life, and that you gave him love and good care. You couldn't have done more for him, and you should feel proud of the care and love you gave him. He appreciated it, you know he did.
Best wishes!