One of the Secrets to a Successful Marriage in Our Home

Apologize.  And make sure the same person isn't always the one apologizing first.  You don't have to apologize for your opinion/belief/stance as long as you believe in your heart that you are correct.  But you do have to apologize for your tone/defensiveness/nastiness that contributed to the argument and any subsequent off-topic tangent you may have dragged into the argument.  Couples are known for not staying on topic and dragging up all kinds of supposed dead and buried issues!  LOL