We will be adding some additional information on this topic soon. In the mean time check out help available on the Resources page to get you started. One specific example is the Gay Christian Network that has many people, both male and female, in the exact same situation. Many gay people have married heterosexually for many different reasons. You can see how other gay Christians have dealt with this and this will hopefully help you to make better informed choices about your own life. Issues like this are complex and sometimes difficult but be assured that many other gay Christians have faced the same issues and have worked through them.
Check out the Book page as well. There are several books written by people who struggled with this issue in their own marriages. Some of these books include, "Stranger At The Gate", and "The Truth Shall Set You Free". These books may give you some insight into how others have dealt with this issue.