Once the state is involved in a criminal matter, the case does not belong to to the victim anymore. It belongs to the state of Florida, which is going forward with the matter on behalf of you and all the people of the state. So before the August 11 date, you need to contact the prosecutor who is handling the case against your boyfriend and let him or her know how you feel about the case and that you don't want to go forward.
You are the alleged victim in this case, and without your cooperation and if there are no other witnesses, the state won't be able to meet its burden of proof beyond a reasonable doubt. The prosecutor will willing to talk to you, because they will always talk to their complainants.
You should try talking to the prosecutor in person, rather than over the phone so that the prosecutor can see your sincerity and ask you any follow-ups he thinks are necessary.
That said, in my experience, as a matter of office policy with DV cases, the prosecutor will probably tell you that the state can choose to go forward with this case whether you cooperate or not. He may tell you that if you refuse to cooperate and testify against your boyfriend, he can subpoena you , bring you into court in handcuffs, if necessary, put you on the stand and require you to testify. He can tell you that if you change your story, he can charge you with perjury. These facts are all perfectly true. He has the power to do all that.
However, as I mentioned earlier in this answer, you are the state's key witness. The prosecutor needs you. So if you stick to your guns and tell the prosecutor that you want the charges dropped, most prosecutors will eventually opt to cut their losses, once they are sure that nobody is forcing you to drop the charges, and once they are sure that you are going to be safe. Most prosecutors do not like to spend time, energy and money going to trial with a reluctant complainant and a case they may, therefore, lose.
So if he won't agree to drop the charges, at that point you need to get a hold of your boyfriend 's lawyer and let him know you've been trying to get the prosecutor to drop the charges but that he will not do it and ask him how you can help him to get the case dismissed.
In my experience, when the complainant and the defense lawyer join forces to double-team a prosecutor to convince him drop charges, something favorable to the defendant, even if it's not a direct dismissal, can almost always be worked out. .
So, in short, the prosecutor is the only one who can drop this case, but the process starts with you letting him or her know that they don't want to go forward.