Dear
@Holar,
thank you for your question.
In your case you have to let know the Ausländerbehörde that you are about to get married to a german woman, and submit all the documents from the STandesamt(wherey ou applied for a marriage date).
Did you appeal against the decision, if yes please inform the court as well.
I hope we could help you, if you need further help please feel free to address it here in the community.
Best regards,
Nilab