When you say you're sorry in order to end the fight, then you may leave issues simmering beneath the surface - an unhealthy situation for both of you. If you're not sorry for something you've said or done, then say so! Apologizing to remove yourself from the negativity of the situation or to please your mate won't get anything accomplished, and it can reinforce negative feelings about yourself. Instead of reflexively apologizing, try stepping away from the situation before uttering the "s" word. Take a walk or a drive, and reflect on potential solutions to the problem. Give yourself a break from shouldering all the blame, and you'll begin to love yourself enough to stand up for yourself when you need to. And that's nothing to be sorry about.