Just like all things in life, there is an ebb and flow to everything --- the tides, the seasons, and relationships.  Recently, I know of several clients and friends who have gone through this letting go process.  It can be very challenging, but if there can be gratitude and forgiveness mixed into the healing process, then as the song goes, "love heals the wound it makes."  And, it is good to remember that usually what takes the place of hurt and pain is love and compassion.  Let go and feel the good things that can fill that empty space.