Personal experience.. keep self busy not easy. There will be times you will be free and the memories keep come back. The heart damm ache literally. Somemore if the person is so far away. I wonder how those lose their love on cope. No wonder some willing to suicide with faintn hope of meeting their love one in afterlife if it exist. Now as i type this my heart ache again as i think of her again. Luckily next month gonna meet her
sometimes we are fortunate with the disease of forgetfulness.
With time, as we ages, our brain will forget more n more.
There is no formula for this kind of things, you can try make yourself busy, do others thing to distract your attention. Exp: busy of working, do some outdoor activities, exersice, listen music, watching movie, hang out with friends etc. After a short time period, can try date another girl. Times will cure you.