The reason why prerna feels so alone is despite having everything she is void of love. Even bajaj after having prerna is void of love to. Life is meaningless if you don't have love with one another. She loved her ex and he betrayed her. Revenge and vengeance makes a person lonesome. In her eyes she saw her ex make a life with her worst enemy. She cannot see that the man she is living with has so much love for her. I want bajaj to confess to her so she knows his feelings. Even bajaj doesn't confess or Prerna doesn't find out the story can't move forward