"Besides that, all this time I was working for free anyway"

You are not entitled to leach off their father now because in the past you bore children and took care of them with his $2000 a month while he took care of you. You better figure out how to support yourself now. Go play your poor mommy card in court, it sounds like he was smart enough to have prepared to fight your greed. If half the time with the kids and half the assets are not enough I hope you get what you deserve, which will be a significantly less than half now after the long upcoming legalities. And keep up the alienation too, the kids will be better off with him when they get older and realize what you are.

You are a good candidate for mediation if he has already presented offers. Accept half in mediation. Make plan for re-entering work force and littles one's care WITH dad. Move on amicably for everyone's sake. Don't make your kids suffer through it.