Get a copy of his check and see what half is, deposit half ino your account effetive immediately.
Do you have a joint credit card - take your name of now. Get your own credit card.
Run a credit check to see what bank accounts he has. You are entitled to half. Does he have a 403 B, yep half. Is your name on the mortgage - half, you get my drift.
Don't let him string you along, you have kids. Have you spoken to a lawyer yet? If not, I suggest you do so ASAP. If nothing else just to know your rights.