if I were in nisha's place I would have forgiven viraj but would never accept his love. Once trust is broken it is very difficult to mend it. What is the guarantee that viraj will not behave like that again???? Nisha may also bottle up things co she feels he would not understand. But at the end of the day its a show. We can't expect logic in it. Even though naux is one of the most logical serial as compared to others.
Meri maano toh nisha should atleas wait until she finds herself. She has to become independent and know duniya daari. Then only she will be ready for marriage. For that she has to have a career. She is only 22. Let her work for sometime say atleast up to 25. Then she will become mature and then will be the right time for her marriage.