What does the moon never holds a grudge mean in the rhapsody on a windy night?

It means that every day is a new day; everything can be forgiven. The moon still appears each night, regardless of the events on earth.

well here's and example, lets say that your friend is very mad at you but they say it's OK but your friendship isn't like it was before, and it's because they hold a grudge against you, something they don't like about you, but the moon on the other hand you can say whatever you want to it and it won't do a thing about it so I'd say "The moon is my only friend" Some people might say dogs or cats etc. but if u scream at a dog, he's either going to get mad or sad and probably growl at you and want to bite you