regarding women of course... its like i should be mad, but i feel bad cause shes upset and i want to be nice.... gaaahhhhhhh 
If you are mad, but concede the issue just to placate her, you're selling your personal integrity short, and she'll respect you less for taking a stand.
If she respects you as a person, it's ok to be mad at each other. It's the holding it over someone's head or not giving up the argument that will help you both grow to hate each other

If you guys can be mad at each other and an hour later blow it off and have a good time, forgetting what you were mad at each other for, she's a keeper. Put a ring on her finger as fast as you can, and count yourself lucky you found her as soon in life as you have.