Nomore the attack you are describing deserves a call to the police. That is not okay but I know sometimes we just deal with these things and don't realize how bad things really are.
Once his violence is on the record it will be much easier to get supervised visits only I would think. Someone like that just can't be around the kids alone. I am so sorry this is happening to you. You have to get things reported though asap for the sake of the kids.