About all you can do is speak to the prosecutor. The state assumes you will refuse to cooperate since more than 75% of victims do just that. The prosecutor may refuse, or they may have you sign documents acknowledging that not cooperating is not smart and/or that you ill not hold the police and the justice system accountable should you be thumped again (which, statistically, you will be).
It is an odd thing that victims will protect their abusers - even risk jail (and further violence) - to do so but, the abuser will not do the same to protect their victim.