Is a friend really a friend when they cant keep your conversations confidential?

     Is a friend really a friend when they can not keep your conversations confidential?  You confide in your friend when you need to vent, but what happens when you confide and you here about it the next day from someone else.  What do you do?  Do you confide in that friend again? Do you confront them? Do you regret every time you vent hoping that that someone hasn't spilt the beans?  What to do when you have no one to vent to.