Fighting in a dream often externalizes an inner conflict rather than describing an actual grudge -- two parts of yourself in disagreement, dressed up as an opponent you can see and swing at. Who you're fighting, and whether you're winning, usually says more about the tension inside you than about that person at all.
Refuse the Moon in Cancer or Scorpio for marriages, unless it be in marrying of widows. - William Lilly (1602.-1681.)