"Expectation is the root of all heartache" - William Shakespeare

Expectation means a very strong belief that something will happen or be the case.

In the case of uncertainty, expectation is event that considered the most likely to happen. An expectation, which is a belief that is centered on the future, may or may not be realistic. A less advantageous result gives rise to the emotion of disappointment. If something happens that is not at all expected, it is a surprise. An expectation about the behavior or performance of another person, expressed to that person, may have the nature of a strong request, or an order; this kind of expectation is called a social norm. The degree to which something is expected to be true can be expressed using fuzzy logic.

Too much expectations lead us to sadness. We our own selves start expecting form someone and then when it doesn't go to the right way we get disappointed, we get hurt. But it's totally our fault there is nothing they can do about. So don't blame people for disappointing you, blame yourself for expecting too much from them. No expectations, no disappointments.

So don't expect things to happen. It is better to be surprised,then to be disappointed.