Boys in their late teens have very fragile egos. If you fight mean, (assault his intelligence and manhood) then it is quite likely over. If it was a fair fighting, (respecting what he said and offering your feelings and view in a respectful way) and you proved him wrong on some point, he will probably lick his wounds and come back. <br />
No matter what your age, if you want your relationships to survive and thrive, you have to learn to fight fair when there is a disagreement. <br />
Yes. For the 479th time.