If my i751 was denied on July 22, 2013 because my wife was not present for the interview, I want to know what to do next?

Once you are divorced refile the I751 and ask for the good faith waiver.

You should be able to get your 10-year green card.

Getting married to your new girlfriend might be a viable option - but only after your divorce your wife, please (don't laugh, some people actually forget to do that part). Re-filing I-751 with a divorce decree will likely get you served with a notice to appear before the Immigration Court for removal proceedings. Solution for your problem isn't that simple, and I can't teach you, in a series of e-mails, how to do what it took me a law degree and years of apprenticeship to learn. If you really want to stay in the U.S., do yourself a favor - retain an immigration attorney.

You can re-file the I-751, this time with a request to waive the joint filing requirement, under one or the other provisos of the I-751 since she is refusing to join you in filing that petition. However, I seriously believe you should consult with an experienced lawyer. A denied I-751 almost invariably will result in the termination of your green card status as well as the initiation of your removal proceedings