A simple friend identifies himself when he calls.
A real friend doesn't have to.

A simple friend opens a conversation with a full news bulletin on his life.
A real friend says, "What's new with you?"  

A simple friend hates it when you call after he has gone to bed.
A real friend asks you why you took so long to call.

A simple friend seeks to talk with you about your problems.
A real friend seeks to help you with your problems.

A simple friend wonders about your romantic history.
A real friend could blackmail you with it. 

A simple friend thinks the friendship is over when you have an argument.
A real friend knows that it's not a friendship until after you've had a fight.

A simple friend expects you to always be there for them.
A real friend expects to always be there for you!