I would be careful with the whole sitch. Your S has your best interest at heart but right now I think he is very disappointed in your H and he doesn't want to see you hurt.
Yes, look out for yourself and your kids but I wouldn't say anything to your H during MC about what your S said. Don't try to make your H see things that a "normal" person would see right now. When they are in MLC, IMHO, they aren't "normal."
I am glad you had a good time at the party. Please take things slowly, MLC takes a while.