If he will not file, there is not a whole lot you can do but file for divorce yourself. You can not make him file for a divoce if he does not want to. There is nothing stopping you from filing for the divorce.
Do you have a separation agreement settling all property and debts?
Do you and your STBX have any children?
Are you wanting him to pay you alimony?
If yes to the first question and no to the last two questions, you can download the papers for a divorce from this site. The only cost will be the filing fee which varies from county to county(Scotland County has a $150 filing fee).
If you have children or want alimony and you do not have a separation agreement signed and notarized, I would definitely talk to a lawyer before proceding with a divorce.