I am a boy,i had only one best friend,now he is not talking to me anymore.

Hii..i am a boy..i had my only one friend..he was my best friend..i am shy boy..and I don't know how to make friends..but he was my friend..now I don't know why he is not talking to me anymore..i didn't do anything..i m feeling very alone..he is having fun with his other friends..can anyone please tell me how to make friends..and what should I do?? I think I will not able to make any friend in my life..:(