To deceive or lead someone on without any real intention.

धोखा देना या आगे बढ़ाते रहना

English Usage: He strung her along for months, making her think they would get married.

Hindi Usage: उसने महीनों तक उसे धोखा दिया, उसे यह सोचने पर मजबूर किया कि वे शादी करेंगे।