Greetings Judith Lee,
Welcome to this website! You can learn alot here!
'What does this mean?' I can see that it means at least three things. Others could probably add to this list. It means IMO---
your friend cared enough to want to get in touch with you from the other side;
you are able to hear him when you're not too busy (you are 'clairaudiant" just as those who see images are 'clairvoyant')
you are curious enough about it to not dismiss it, so you will probably have more experiences from 'the Afterlife.'
Many of us here now accept those possibilities as 'normal'.
If you'll read Bruce's essays (listed at the top of the index pages) you'll have a better sense of what we're exploring here. We try to help each other find the best way to address our questions, since we all have questions because we're all growing in our understanding.
May your explorations bring you much happiness, knowledge, and faith!
bets