I am confident that writers will never show Ritwik and Sona getting married as it will portray a totally wrong set of emotions to the viewers:
(1) -Making a mistake and never getting a second chance to correct it
(2) -Not to understand your partner's point of view and and moving on in life easily
(3) -Promises that are meaningless and were said only to be said and not hold on to them in testing times
(4) -Not to fight for one's love and easily give up