Is the # that big of a deal?
Maybe it's because she is ahead of you....
Maybe you realize you're moving fast at university and being committed at that age is hard to do these days especially with you being a few hours away.
You're in your 30's and hopefully smarter than the story you type.
After eight months you should know how significant you want the relationship to be. If it's not what you want, let her know and move on.
Plain and simple.