It's really not healthy for your relationship if during fighting, you take those low blows. Don't bring up things from the past, or attack someone's character. These types of things can affect your relationship in the long term Try to be as nice as possible, and stay away from "you" statements, because they can cause the other person to close up.

__________________
-Brittany Brydahl

COOL advice but do you think when in a fight all these are possible?? everyone will be trying to hit first and hit hard with words.. And only after the fight i realize the clever things i could have said.. But such sensible comments comes in mind only after the argument, which is really sad..