Every person that we meet, communicate with, etc. becomes part of us whether intentional or not. Those that we spend time with and care for become large parts, and loosing them is a big personal loss.
It is easier to say goodbye to a Christian, because I know that to them, their belief is that they are gaining and it is only painful to them to miss us for a time. I am sure that others have similar ways to cope with death. I have seen those that do not have such firmly held beliefs also. I feel so sorry for them as it is very terrifying and final to them.
Mark, I do hope that you and your aunt have such beliefs that give comfort. Friends and those on the forum can help a little with words.