I been engaged to a woman in a near by state for nearly two years now I found out other night end of last yr she married another guy and is not happy in marriage what would be the best course of action for her to get divorce or anullment from him.

First need to know what state and was there any other factors other then " not happy"
You should ask yourself if she was engaged to you, why did she marry someone else, and is everything she telling you the truth or does she just not want to lose you as a friend or thinks you are a good listener" and he never listens.