I heard someone once say, you meet the people at their truest at funerals and in Divorce court. If you are blind sided by the prospect of divorce then the real reason for the divorce request will reveal itself quickly. You need to find legal counsel ( Female) and stock up on anything she will not miss asset wise.
Marriage counseling in most cases , can extent or mend depending on the reasons for the divorce request and the character of BOTH partners. If forgiveness is in both hearts you may come through stronger. If neither is a forgiver, then you are prepared.