I agree that you should skip anything about the children (which will just be taken as you laying a guilt-trip), your own areas of focus (stop telling him everything right now while he's not your H) and your plans to get legal advice.
My experience of an MLC man was that he was obsessed with what everybody else had and was earning (and blamed himself for failing) and saw his kids and W as a liability which had partly put him in that position. He was ADAMANT he'd try to hide money before he gave us anything. Post-MLC ... he's furious with anyone who rips off his family in that way. In other words, consult with a L, know your rights, but don't tip him off to that yet.
