How can i make myself?

Crying? I recently broke my 8 year friendship with someone who i trusted the most but later it didn't work out between us. He just has changed a lot and it was like he just take me for granted because he has another best friend (also a woman). I also had feelings for him in the past and i think i still have. I've tried to break this friendship earlier but because i missed him i started to contact him again , but nothing changed everything repeated again...Now i know our friendship will not be the same anymore like it use to be so this time i ended it (again) but this time for good. But i feel so sad i can't sleep i slept at 5:00 a.m cried myself in sleep..i woke up i cried and now i cry the whole day and i'm getting sick of it. How can i make myself stop crying for him? I know you people will say it is normal because i'm grieving but i really want to stop crying and think about him.