There's no positive outcome except you cancel or withdraw this one. You wanted to make your file stronger but you make a huge mistake which is you were common law partner and you did not flag it to them. This not a minor mistake and you have to anticipate a rejection or headache and the simple thing to do is «Cancel». So that, the file won't be processed and you are good to fix your mistake and Re-send your new application.
I will be cancelling/withdrawing my application. Question is, hopefully, they will not keep the cancel papers. Will they? I will submit a new application with the correct information.