I don't often respond to postings ---but yours caught my eye. I think you have gotten some great advice already -- but all I can add is that you need to understand MLC as much as you can. Then you won't be so blown away by all these crazy antics. And you also won't have unrealistic expectations about the length of time that this will take ---etc---etc.
There's a lot of good basic information on this site about MLC --suggestions of books to read --and just basic do's and don'ts in respect to dealing with a spouse who has gone off the deep end and left you "holding the bag". Study all that you can --you will never regret having this kind of knowledge.
If you are interested - there are some Christian sites that encourage hanging in there ---even in the face of being divorced. God can heal many situations and restore marriages that otherwise would have been lost forever. But it takes a serious belief in His guidance and power --and a commitment to see the process through to the end --no matter what the circumstances.
Divorce is by no means the end. It is up to you as to how you want to respond --and if you believe that you are being guided to stand for your marriage.