What you do, is go down to the courthouse personally and speak to the clerk of the court. Tell the clerk you are representing yourself (the legal term is "pro se") and you need to file an Order to Show Cause to vacate a default judgment. Many courts will provide a pro se litigant with forms for this purpose, to make it easier. The Order to Show Cause should be filled out with the name of the case, the docket or index number, the relief you are seeking (in your case, it would be "vacate a default judgment") and your excuse for the default (for example, "I received no notice of a hearing date or trial"). The form will also probably ask you if you have a valid defense to the plaintiff's lawsuit. This is to make sure that if the default is vacated, you will not be wasting the court's time with a trial on a case where you have no defenses. You would write something like, "Plaintiff is my ex-girlfriend and she fabricated completely fictitious claims. I do not owe her any money and her claims have no basis in fact."
In the majority of instances like this, a judge will sign the Order to Show Cause and give a date for a hearing. You will be instructed to serve the Order (by certified mail, personal service or some other method).
On the hearing date, you will explain to the judge why you did not appear on the trial date, and why you have a valid defense to the suit. Your ex-girlfriend will probably be there too, telling her side of the story.
It is more likely than not that the judgment will be vacated and you will get a chance to defend yourself at trial.
I hope this helps.
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