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Since he filed the divorce, he'd need to sign off on any final decree to finalize the divorce. You would not be able to finalize it yourself without at least that much cooperation from him.
In the future, you could file for divorce yourself, have him served (or sign a waiver) and proceed with the divorce.
More than likely he just didn't send the waiver yet.
You would need to wait for it to be dismissed before you could file your own. If you filed your own right now it'd be either consolidated with the current case (which would still require his cooperation to finalized) or dismissed based on the prior case already being filed. Most Judges in Texas will dismiss a case if there's no movement on the case in 6 months to a year.