Is reciting the Fatiha considered a "humiliation" if other matters are agreed upon later, and is it permissible to supplicate for marriage to a girl who is engaged to another man?

It is permissible to propose to a girl before being able to afford the expenses of marriage. However, it is preferable for the suitor to be able to bear the financial burden to avoid a long engagement period. This varies according to circumstances and customs. Since the matter has passed and the girl has been engaged to someone else, one should not dwell on the past, nor should one pray to be united with her after she has become engaged to her suitor.