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He is playing with fire.
If she had him arrested wrongfully she could be charged with false reporting and perjury. Though she does not have say so over the outcome of the criminal charges she can contact the state's attorney and express her wishes. Since the state's attorney will make the ultimate decision, he should be very careful not to make incriminating statements to anyone and should seek counsel with a local attorney. It is vital that he not place himself in jeopardy of further criminal sanctions.
Again, if she went so far as to charge him wrongfully he should take care not to put himself in a position to suffer a similar future occurrence.
Basically he should seek an attorney's help at this point and not speak to anyone about the case until it is resolved.
Please reply if I can help further.
His chances are very good. However the state's attorneys are used to victims being reluctant to prosecute so he should be on guard for an aggressive prosecutor. This means keeping his mouth shut and having an attorney present. The prosecutors are interested in convictions and will immediately be biased against him.
He should keep this in mind.