Exactly What You Wanted

I'm not so good realizing
Who i can or cannot trust
It's best to keep what matters vague
With harmless lies i can adjust
I get a "d" for disappointment
Now there's nothing to regret
Everybody's good for something
At least you know what you won't get
I let you down again
What's another harmless
Lie between friends?
Now you can be disappointed
I thought i gave you just exactly
What you wanted