friendship

What is a friend, to you? Is a friend someone that says "I would cut off my left arm to give you, if you needed it"? Or " I have NO MONEY but will throw myself in overdraft because you need some"? OR "It's not mine, but you can borrow it IF you give it back." Is this a friend? Is a friend someone that will/has/will do anything for you? Cause i thought i was a pretty good friend. But i just learned that if i have nothing tangible to give... I'm not your friend at all. Thanks.