How would you handle a crazy ex husband who presses unfounded harrasment charges against you?

Your ex presses harment charges on you, after you had first pressed charges against him. He is getting himself a public defender, you decide to represent yourself. He has unfounded charges and you have tons of doentation and witnesses on your part. Do you think the reason why he has a public defender because he knows he is guilty and could end up in jail? He had previous harrment charges against himself before in the same town's court. Sentencing for being found 'guilty' are $500 dollars in fee cost and 30 days in county jail. Do you think he is afraid of going to jail? Has anyone ever had false harment charges against them?