A familiar call

Why izzit that when we seem to want something so bad, and when we cant have it, it juz tears us up inside., yet when the time finally comes for us to have it, we dont want it anymore. I am guilty of this, and i cant find a reason to it.

If we want somethin that bad, shouldn't we always want it, or are we juz so shallow creatures that we juz like the chase, or izzit because humans are born to be discontented all the time. But not all humans are like dat right.I am one who, when i want something really really bad, i go all out for it. Once i get what i set out for, it seems though im done with wanting it and am ready to hop on to the next thing. There are also many examples that prove my theory right... like how the straight-haired girls, they all want curls. and the brunnettes wanna be blonde. Its juz your typical thang. You've got yin, you want yang.

It juz goes on and on... and some people says its only humans to never be satisfied. Well i guess im as human as the next one. Part of it is also because i keep lookin and lookin and lookin for something more and always wondering whats on the other side of the "number two door", if u get what i mean.. So do you go through the same thing? U want something soo badly but when u have it u get disatisfied. If so,why?
Thoughts welcomed.