First of all loyal and faithful, and even good, honest, courageous, responsive, one that is not afraid to tell you the truth, but always support in a difficult situation... Sometimes I think we make excessive demands on their friends. After all, everyone has the right to be wrong, everyone has flaws. Perhaps we understand this later when povzrosleem and become wiser.
In the meantime, still need to think about is that if you want to be called a true friend, you must be yourself the way you would like to see his friend.