Never apologize for what you feel. It's like saying sorry for being real.
In this day and age, being politically correct is held in high esteem by the masses, and keeping it as real as possible is treated in the exact opposite manner. Instead of worrying about fixing your lips to sing the song that everyone else wants you to sing, place an emphasis on just being who you are, day in and day out.
Apologizing doesn't mean that you're wrong and the other person is right. It just means that you value your relationship more than your ego.
Let's face it, we are all human, and at some point in our lives, we are going to mess up. When your significant other messes up, it's easy to be upset, especially when it feels as though they may not really care as much as you do.
Never apologize for what you feel, it's like saying sorry for being real.
Just be who you are. There are so many times that we are discouraged from displaying our opinions to the world. We are attacked and told that we can't continue to be who we are, and expect to be successful in whatever business we are a part of. Don't keep apologizing for being who you are. There is nothing wrong with you. No one is perfect, and no one will ever be. You will find that your life will be much more worth living when you don't have to play a role and in public act differently than you would if you were around your truest of friends.
Apologizing doesn't always mean that you're wrong and the other person is right. It just means that you value your relationship more than your ego.
We must remember an apology isn't an apology unless it's meaningful! If your apology isn't sincere and you're just apologizing to avoid an argument then that can just lead to more damage. Also you can't just apologize for everything, you have to know what you're apologizing for.