Once you involve the authorities in a domestic incident, the police MUST make an arrest. They no longer have any discretion to do otherwise. The resulting case is not yours any more. You're just the complainant. It belongs to the state prosecutor to deal with as he or she best sees fit. He can drop the charges for you if you talk to him and can convince him that you don't want to prosecute and that you will be safe without the state's intervention and without a protective order. But he can also tell you that as far as he is concerned your boyfriend committed a crime and that, regardless of what you want, he intends to go forward with the case. He can also remind you that he has the power to subpoena you, bring you into court, in handcuffs if necessary, put you on the stand and compel you to testify against your boyfriend.
All of the above is true. However, most domestic violence cases are he said/she said cases that cannot be won without the cooperation of the complainant. A prosecutor can go to trial with a weak case where the complainant may testify favorably for the defendant instead of for the state, but when the chips are down, most do not like to do that.
So go and talk to the prosecutor handling the case against your boyfriend. In person is best so that he or she can see you're okay, can see that you mean what you say and have not been coerced into changing your story, and so that he can find out and see your reaction to whatever concerns him. Maybe he'll allow you to drop. If he doesn't, you'll have to rely on your husband's lawyer to get the job done. But in my experience, once the defense lawyer knows that a DV complainant is not interested in going forward, does not want to cooperate with the DA and has been trying unsuccessfully to drop the charges, he will also bring pressure to bear. When the defense lawyer and the complainant start holding hands to double team the prosecutor and push for a dismissal, something very favorable to the defense can generally be worked out