Because every women will have in some corner in their heart that they should have their own child the one who will call her ma .The first sight of seeing your own child is the most fabulous moment in every women's life.It is each and every womens right for motherhood. before marriage if aryan had not known this problem then vaidehi would have accepted the truth and lived a happy life with aryan,but no women will accept her husband if he had hidden the truth delibrately.
O.K this is only a serial and fiction show and hence many of us want vaidehi to forgive Aryan.But in real life it is very difficult to accept the truth and forgive