Losing Friends

ok, so idk if i had mentionded this before but one of my friends just recently left. well, left my school. he was supposed to go to paris, but ended up staying here, just not at my school.

We were best friends. we told each other everything. and he used to talk to me everyday and every chance that he got, but now its like we are complete strangers.

He wont respond to my texts, which he always does, im not exageratting. he wont respond to my calls either. and since i dont have a facebook, i asked my older sister to check if anything had happened to him, but he is fine.

And lately it feels as if im slowly but surely losing all my friends. its really scary for my considering the fact that i have very little friends.

What should i do? Im so confused.