See my response to your sibling, below. There's no contract that someone owes you a followup email. Many times, it's better to end things instead of fakeness o

See my response to your sibling, below. There's no contract that someone owes you a followup email. Many times, it's better to end things instead of fakeness or platitudes. Also, "basic manners" is ambiguous because there's no universal definition. Regardless, there is a cost. Saying otherwise is dishonest.