if there is not season3 then what the zero will be no relationships either then what about the relationship between yuki and kaneme will marry atau not

Read the manga.

The future of Yuuki's relationship with both Zero and Kaname is revealed in the komik jepang upon which the anime was originally based. Either read that manga, atau read the jawaban to sebelumnya pertanyaan on this site, which already summarise the events in the komik jepang after the anime finished (and the events which happen in the komik jepang which were changed in the anime).