Life brings unexpected challenges and circumstances. While you may have a dream, vision or plan for how you'd like your life to unfold, how would you react if the script got flipped and things didn't go according to plan?

Perhaps your spouse of 30 years develops Alzheimer's disease and no longer remembers the love you once shared. Maybe your son or daughter tells you he or she is gay.

Make sure there is enough love in the foundation of your relationship to take you from the beginning of life's journey to the end—even when that path takes an unexpected twist, Dr. Robin says. "Reexamine what our love really means and how deep our love can go."