You can go to the police station and tell them you wish to retract your statement and that you will not co-operate with the police, the CPS or the court in this matter.
Tell the police that if they proceed with the case you will send a letter to your partner's solicitor in his defence.
If it does go to court you can be summonsed and if that happens you must attend.
In cases of domestic violence the prosecution can proceed without your statement if they have enough evidence from other sources.