In my opinion, you should let it go. The time, studying at school and other things will help you. If you can not, you try to contact him as an old friend. If he still loves you, you can show your love. Unless, you should kip it in your mind. The time fly and you will forget. Do not make you life stuck cause one thing in the past. Start you life again without him.
I hope you happy and can find another one who can love you as you love!
Sincerely!
Jenny
My email: jennyvo0510@gmail.com
Skype: ngocdung1090