How can i get my ex back?

Were both 15, I dumped him for a really lame reason after 10days about a month ago and now he wont talk to me anymore on facebook he goes to a different school and now i realise i miss all those times we had hanging out, he was so nice and kind and hot, he called me beautiful instead of hot and said i love you instead of ily and he was good for me now i regret it but i dont know if he would take me back or not if i talk on facebook he dont reply what do i do? By the way i cant call him