On the issue of "No matter how right you are, she is," though that can help during times when she's more unstable than usual, it's always better to avoid confrontational talk altogether. Focus on the solution, not who is right, and you'll both profit. Remember to keep track of how things are going in the relationship, and write down any big or new things. Review that list each month, and see if any trends have emerged (it could be both good or bad, she might be giving you more 'fun time' or been unresponsive). Either way, try to act on them. If she's been gloomy, and you can't cheer her up, man up and ask her why in the least threatening way that you can. It's that sort of openness that's very difficult, and therefore very scary. If we were that open all the time, then we'd get hurt. Heck, being that intimate with a girl scares me, too.
The most important thing is to never, ever (barring abuses of this rule) feel like you can't tell her something that pertains to her. If that is true for you, then it's likely true for her, too. That kind of distancing will crush any relationship. Building trust and having you both feel safe talking to each other is the only way that the relationship can grow past "Wham, bam, thank-you ma'am" in a safe, stable manner.
-Penguin