I want my lover.i am in love,my lover engagement has completed?

hi,i am naresh.i have a problem.i am in love,my lover engagement has completed,marriage was not confirmed wen happen.but after 6 months it may.so,i want her,she also want me.she does't like that to escape from home to marry me.she want her parents and me.we decided that to talk her parents,but they will not agree,bcoz her brother also got same situation which we get,now her brother marryed his lover,now there r not happy,they decided that to take divers for unhappy life ,for this reason only they wont agree wat should i do