The expectation of expectation

It is in the nature of expectations to lead to disappointment.  Yet as humans we expect things, we expect people to love us and we expect the weather to cooperate and sometimes we even expect that the experiment we ate creating in the kitchen will turn out well.

We get disappointed sometimes even disillusioned yet we shake it off and on expect something else off someone else. . sometimes we expect to be disappointed yet why is it that we never stop expecting?