Why need friends?

Why needs friends when you have friends like this:

Just this week my gd friend contacted me and asked to borrow a dvd, and it got me so pissed. Why? Because we were suppose to meet 2 mths back which she did not show up. Then she decided to contact me now- 2 mths later, asking for the dvd and nothing even mentioning about why she never turned up that day. . What the hell does she think I am? We have been friends for long and yet she treats me like dirt! I just don’t understand why... So disappointed with her...

Her reason, she decided not to talk to anybody. Huh???? That’s just a lame excuse.

Then there’s another guy who I lent $200 to saying he need it for his sick mum. He was only force to give it back after 1 year when I threaten to call his "sick" mum and tell her. Thinking back, I was so stupid and naive then. Bloody moron he is.

I now doubt why we really need friends for, when they will someday and somehow come and plunge a 6-inch dagger down your back. – and later when you are on the floor laying in your own blood, he/she will devilishly smile at you and….

So again I ask - Why need friends when you have friends like this?