He sacrificed his love for her happiness
She felt betrayed as she could not understand his love for her
Sharad:
He met Gitika, fell in love with her and his life changed forever. He felt they were destined to be together, but fate had something else in mind. His love for Gitika caused him to separate from her and that love still makes his heart beat for her and wants her to be happy no matter where she is.
Gitika:
She met Sharad and felt her life was complete. When their hidden love was found out, she misunderstood Sharad's intentions and was humiliated. Her guilt and the pain she caused her father caused her to sacrifice herself. Though she knew Sharad still cared for her and wanted her to be happy, she was forced to choose sorrow, hoping Sharad would forget her. She sacrificed her love for her duty towards her father.