After all the "lovey dovey" moments in the honeymoon stage and after all the farts you have given out, we come to "WAR".
This stage is basically fighting back and forth. I'm not saying EVERY relationship is like this, but I'm pretty sure most relationships are.
This is a stage when you know you have your significant other wrapped around your fingers so losing them is not even an option in your mind because you KNOW you have them. This declares for war. You guys fight more often, argue more than usual and agree to disagree.
Now, this "WAR" can be healthy for a relationship. If you look at it this way, people fight to prove a point, people fight because they want a solution to a problem that something or someone has made. So why do two people that love each other fight? Because they do not want to give up. If one person does not fight for the other and just simply walks away, then that person was not for you because no one would want to see their love ones go. So you fight. You fight to be with them. You fight to keep them.
Fighting is like the flame of a candle. You try to keep that flame going as long as it can, but if you blow it out then the light eventually disappears. You have to leave the flame in order for the wax to melt. You cannot just throw unfinished business.