sad (and i hope this doesn't offend you), but you've come to this site for almost a year, each time saying how horrible it is and how you're planning to leave or how "one more time and it's over." what will it take to make you understand that things aren't going to change unless you're the one to change them? if nothing has changed thus far, i don't see it changing anytime soon, no matter how much you threaten or beg.
when will you begin to see that no one deserves this? if she hasn't been willing to change and things have only gotten worse throughout the past year, take pride in yourself and show how much you value your life by taking a step back and see what's worked so far and what hasn't.