He felt it today
As he sat in the balcony, having a smoke, he remembered. He had moved on, atleast he thought he had. He thought how unbelievably in love she was with him, how pure a relationship they shared, how much she trusted him, but he hurt her. He knew how strongly he felt for her, but he had to do it for her to get on. He was fine, until this very moment and he knew she would not have moved on. It was a chance he had taken not for him, but for her.
And now he could feel the pain.
PS: flicked the photograph from google images.