The fact that your boyfriend has deceived about his identity can indeed be a reason for deportation, which will probably also be combined with an entry ban to Germany and the entire Schengen area. Unfortunately for you, even getting married will not be able to change this. Especially since you must present many documents also from Pakistan for a marriage in Germany, some of which must be translated and certified.
Experience shows that this takes a long time. We also do not know if your boyfriend has taken legal action against the deportation decision or the negative asylum decision. If he has a re-entry ban, which can be valid for a maximum of ten years, he is not allowed to enter Germany, one of the Schengen countries or an EU country.
We would strongly recommend you consult a lawyer who is well versed in asylum and immigration law or to go to a counseling center.
This artical was published in German.