One of my favorite quotes of all time comes from poet Robert Frost: "In three words I can sum up everything I've learned about life: it goes on." Indeed, for better or worse, things will never go back to the way they used to be in our lives. We change and the people in our lives change, which in turn means that our relationships evolve.  Some of us are lucky enough to have friendships that have remained mostly intact for many years -- ones we forged as early as childhood.  But such friendships are a rare breed.  Our experiences over time affect virtually every facet of our lives: personality, lifestyle, beliefs, attitudes, taste in food and music, and so on.  Nothing changes a friendship quite like a major lifestyle change -- from moving to getting married and having kids.  But change isn't always a bad thing. How would we grow if our lives all remained the same? It doesn't mean our relationships have to end; they simply evolve....