"Moving On'' by Tim House

The story gave me a thought the main character is living in the past not moving on. Either she is living in a fantasy world with memories of her late husband such as smelling his clothes, cooking dinner for two. Maybe also she her new husband Charlie is a rebound for her late husband and in her mind is still in love with her old one. Honestly i can stay this new marriage is not going to work and doom to failure. My question is why cant she move on and be happy that a man has interest in her.