QOTD: Is An Ex Really An Ex For A Reason?

The good ol' saying, "an ex is an ex for reason" is self-explanatory but is it true? Is it possible that after taking some time to grow and maybe outgrow less than favorable habits you or your're ex may have had that you might have a successful relationship the second time around? Or should exes be left in the past along with the relationship you once shared? Comment below and let me know what you think!