Although I'm never wrong (lol), my wife and I only ever argue over really important things ( probably 10 or so serious rows in our whole ten years together) so when we do, it does get very heated as it's very important to us.That being said, both of us are quite sensible and don't let the row in question spill over into other areas of our lives, as it gets destructive then. If I am wrong or borderline wrong I'll apologise as will she, but mostly we just agree to differ and niether apologises as we both genuinely think we are right if we bother to have a row about it.