Of course it is very well said. It's Stephen Covey and his 7 Habits). As for me I think each case is unique. We also should not forget about chemistry. The fact of the matter is that love involves chemical connections within our brains--despite how unromantic that sounds. And when it's over you find yourself face to face with a real person with all his faults and defects. And then either you accept and love him for who he is, either you let him go. Why torture him and yourself? Each of us worth love and happiness.
One thing is clear -decision about the final break should be taken If you believe that there is no other choice but divorce.