for the sake of getting a bright future

Apparently it is not easy to forget someone from the past. Remember of him will probably lead to spark memories. But really, it's just an illusion, because it was already past. Never imagined how difficult it is against this feeling. Somehow I always look back, not just occasionally but repeatedly. 
I know, I should be able to live my life now unencumbered by the past. But he always stay in my mind. Crying and regretting the past wouldn't change the situation now, so I should be able to smile and enjoy the present life. For the sake of getting a brighter future.