Yes, the distance will come between you after he moves but the bond you've created will still exist. It happened to me with a dear friend many years ago, and we stayed in touch via phone calls. Sadly, it all came to an end when she passed away but I keep a special place in my heart for her and will never let go of that.

Have you expressed to him about how you feel about his leaving, and what his friendship has meant to you? I have a feeling he'd feel really honored that you think that highly of him. To be told by someone how important they've been in your life with their positive influence and friendship would be a gift to them in my opinion. If the position was reversed, what would you like to be done? You've been blessed to have someone like this in your life, and I hope your friendship will continue.

Best wishes to you in dealing with this. Hoping the outcome will be a good one for both of you.