We all have friends... but not all of us have real friends. There's a big difference between having a simple friend and a real friend.
I can site a hundred examples that differentiate an ordinary friend from a real friend but It's really hard to spot the real one from the ones you are keeping now! They will all act as if they are, and indeed, they will really let you think and feel that they are one of your real friends only to find out months or years after that they aren't!