Most likely both. In MLC they think that we are the problem, as well as the relationship. Therefore, they want a divorce and many will not even attempt to work on the relationship after they have entered MLC. Once they get divorce into their heads, very very few will opt not to continue to move forward with the action. Many will kick and scream divorce and will stall along the way, others will charge right out the gate and get it done. For those who kick, scream and then stall, many of the lbs will eventually get fed up and file themselves. Why? To protect what is left of the assets, not be liable for what their spouses are spending funds on, etc. Many lbs will eventually get tired of the bs after a long period of time and just file in order to move on w/their lives.
I know that this may not have been the answers you were looking for, but you need to prepare yourself for whatever your spouse may throw your way.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.