you come across as being quite young...first of all, you have a crush on this boy, and you should not have to prove you love someone, as a young lady should never have to throw herself at a boy for his attention. RELAX, and give it time
Some guys want the girl to have sex to prove their love. Your guy may have this in mind. If not, you must have given him a reason to think you don't love him. If you're not showing it, you may not really love him. I think a person in love can't keep from showing it.