That is why a lot of Black American women do not want to marry African men. It is not a very good idea to marry a guy you have known for such a short period of time. I had one who proposed to me after he helped me take my groceries to my car. He asked to meet my family. I never met this man prior to this.
Another occassion I simply became acquaintance with an African male, he became very clingy and controlling after a week, and warned all the other men to 'leave me alone' because he was going to marry me. It was embarassing.
I just don't think its a good idea to marry any foreigners, their motives are not always the best. Most just want a greencard.