branny, sorry you're down. If you aren't ready (or don't want to be) to be married, or you're still not sure if she's the one, then there's nothing you can do- you did the right thing by sticking to your guns.
maybe she's hoping you'll change your mind, or maybe she doesn't want to waste more time if marriage IS what she's looking for, but... its better for both of you to move on.
Doesn't make it easier, I know.