I remember exactly how you felt and feel, seemingly, the loss of such a beautiful friend, love, heart in all their stages, as then they rebel and begin to use what you've tried to teach them throughout their journey? It feels like a slap in the face! a sudden departure, natural to rebel for themselves, we cannot help but let go, if only physically. Until eventually your best friend returns, and, they have a child of their own, and they understand so much more about family!