My good and only friend has stopped contacting me and won't answer the phone, return emails or text messages. I haven't done or said anything to him or about him we where just hanging out one day, and next day it started happening, its been 2 (1/2) weeks. I feel like our friendship can't be saved even though I tried. Should I just accept it and move on? I have asked if he is all right or he needs help, still no answer. I left him alone for a week to give him some time, no help.

Is there a reason they were your ONLY friend as you put it? People don't usually do this without a reason... moving and changing employers is usually two common reasons that you would not have a hand in. Knowingly or unknowingly.

You tried.....if they won't say anything then there isn't anything more you can do.....so move on. Though I do understand the desire to know why.

There must have been reason(s) why your best friend, suddenly dumped you, without any explanation.

It is hard to understand how you could not have any idea at all- best friends usually know each other well enough to say they are 'best' friends.

Instinct tells me that you know more than you are letting on, and I think that if he was your only friend as you said, and your best friend, (obviously), how could you not know why the friendship ended.

What are your ages? Are you male or female?
2 1/2 weeks is a relatively short time actually.
Where were you hanging out and what were you doing the last time you two were together?