Every goodbye sounds ordinary until hindsight tells you it was the last one.

Most endings do not announce themselves. The last ordinary conversation with someone looks exactly like all the others, and only afterwards does it become significant, which is one of the harder facts about being close to people. This is not a reason to treat every parting as momentous, which would be unbearable. It is a reason to be present for the ordinary ones.

When you say goodbye to someone who matters, try giving it a few seconds of actual attention. Not weight, just presence. That is the most anyone can do about something they cannot see coming.