Try talking to your friend and resolving matters. It could
possibly revert back to what you had before. I used the term
"possibly" because there is also a chance things wont be the same.
Most likely during that period, you guys would have drifted apart,
the unresolved argument would have made it awkward for you both to
talk again.
You could be friends again, but because of the major quarrel you
had, it probably has changed your perceptions of each other.
I think Im rather lucky though. All of my friends regardless of
whatever problem or issue that arises, even after a huge argument,
my friendships with them has never changed. If it ever had, our
friendship probably grew stronger. I don't know its weird. We can
just argue oneday, apologise then be normal again the next second.
Its important to resolve the issue as soon as you argue with them.
The longer you leave it, the more stale it gets. Then everybody
forgets what its like to have the other person around and it gets
awkward. Yep =D all the best.!