Well the case is very simple, since you already submitted your refugee case and its in process. The fact that you are going to marry this girl is going to make the case seem fake and not a bonafide refugee. Because in the eyes of the IO you first applied as refugee which means you are fleeing persecution, secondly marriage will make it seem that in the event your refugee case fails you are making a back up plan to stay in this country either ways. IOs dont see this favorably and your future could possible be hanging in the air for several years.