First off, sorry that you are here....but welcome.
Secondly, I am not sure quite what to say. I am happy to hear about another person who is willing to fight for their marriage, but in the same sense, not sure what to tell you.
It is difficult. Sometimes, they need the D to close one aspect of the relationship and to open the door to another, even though it might be with the same person.
In my unprofessional opinion, I would try the mediation route first. It is better and nicer. But having said that, you might be able to get what you need, without seeming bi*chy by using the courts. But that is another topic.
Hang in there! This forum is full of very very very supportive people who are willing to give you some honest answers which is great. Sometimes we need to be told that we are stupid, right?!
Whichever route you take, please keep us informed. Curious about your situation further...why he left when he did for example?
CIAZ M 7/97 S 5/05 D 8/06 Both 33 years old No kids