I always had a belief that forgetting a person isnt as hard as people think. I do agree that it will hurt as hell in the beginning but it will eventually settle down after a while. The first few days, months and years can be your worst nightmare, and gradually you will head back to your normal life, a life without him and a life you are used to before his presence. Atleast that's what I beleieved when he left me, I believed that I will suffer only for a few days or months , and I will go back being myself. Until I was proved wrong.