Question

why is it difficult to say good bye​

Answer 1

Explanation:

It's hard because such moments remind us of the impermanence of existence. One day it will all end, everything we have and who we are will be gone. Saying goodbye is to acknowledge that wheels turn and time passes

Answer 2

because often we don't want to part with this object/person/feeling/memory, sometimes there's emotional attachement towards it so it gets harder.