Question: what to say to your best friend that is moving?
Answer: “You have been my friend. ...  “Don't be dismayed at goodbyes. ...  “How lucky I am to have something that makes saying goodbye so hard.” - ...  “Never say goodbye because goodbye means going away and going away means forgetting.” - ...  “Goodbyes are not forever, are not the end; it simply means I'll miss you until we meet again.” -