Perhaps you should point out to the MC, that part of dealing with D, is how you and your H can get closure on his A and abandonment of his family, and move forward as amicable co-parents. And, until he speaks the truth, you will find it hard to trust him regarding D or finances, and certainly not be able to be on friendly terms.
Your MCer doesn't sound like a very good one ... certainly seems to be taking sides, and not tackling H on his 'honesty' issues.
Take care, HM, this is going to be a bumpy ride, I think.
Me:57 H:52 M:28 Got another lawyer last year and filed. D35,S/D twins28,D22 EA4/04 End? Who knows? "Life is like a mirror. Smile at it and it smiles back at you." — Peace Pilgrim