My question involves a marriage in the state of: Texas

Me and my husband got married 3 years ago. He was previuosly married and he signed all the papers to get divorced almost 12 years ago. Have never talk to ex wife or seen her since than. She is the one who filled for divotce and was taken care of it. Well I am from Russia, so in order to get my paperwork done I need his divorce decree. So I starting to research wher I can get it, and come to find out there divorce was neber finalized, and case was dismissed in 2004. So basically he is still married to his ex-wife. I did all kind of researches to find her and no results. Is there any way to back date the divorce? We were filling the taxes together, and it is really important for my paperwork to get our original date of marrige. I know it is simple to get divorced and get remarried. But we are on a time crunch, and I really dont want to wait another 6 month or so.