Husband threatening to move to California

I have been married for 7 years. I recently told my husband I wanted a divorce. He has basically abandoned me and my two children of 4 and 10. He spends no time at home with us as a family and stays out late most nights. After being extremely nice and apologetic promising me everything and anything for one week he has turned very nasty. He has accepted a job in Washington state and threatened to take my 4 year old, leaving me with just my 10 yr old. 1- Can a court split our children apart and 2- can he move out of state with my 4 yr old.
I am meeting with an attorney next week to discuss, this will be my first consultation since letting him know I wanted a divorce.
Thank you for any help