HELP A BRETHREN

Sir, I am in love with a widower; who has been very helpful to me & my family. He helped me with completing my education & is currently training my younger brother through school. We had an agreement to marry; though he said that he just wants to marry for companionship; NOT FOR KIDS (he has 4 kids who needs a mother)! Considering it now, this is totally unacceptable to me because I want to have my own children. I have tried to make him see reason to no avail; he is insisting we abide by our initial agreement. Pastor, what are my options in such scenario?