<p>I recently have left an organization and have been isolated from those who once called me a friend. I chose to leave the organization and was not forced out and I did not do anything wrong. What can I do about this?</p>

Unfortunately too many preachers today use organization affiliation as their only means of fellowship with other preachers. There is no one organization that is the “body of Christ” so to speak. It is important of course that you fellowship with men of like precious faith but no preacher should be rejected on the basis of the organization he belongs to.
It is usually accepted that belonging to some organization is a good thing. It provides a framework for friendship, ministry opportunity, accountability etc. I am sure that God will lead you in the right direction.
If a man is not your friend because you no longer belong to his organization, it is questionable as to weather he was truly your friend. It is a good idea to call him and try to reconnect. It may be that he thinks you do not desire his friendship any longer. Do not give up on a friendship until you have made moves to save it.
If however, he refuses your overtures for friendship, forget it; do not harbor wrong or bitter attitudes, and move on to other friends. I know it grieves your spirit to be rejected like this but deal with it and do not let it make you cynical or bitter.
Make contact with preachers in your area regardless of their organization affiliation. Many pastors would be glad to have your friendship if you make yourself available. Above all, do not get angry and isolate yourself form the ministry.