Although expectations urge you to be a better person; it constantly keeps a person motivated to achieve his/her goals. No anticipation or expectation means no purpose, no provocation, and no expedients. Yet this is also a fact that expectation is the root of all heartache.
Whether the expectations are realistic or unrealistic, these can be the reason for the heartache. But mainly unrealistic Expectation is the root of all heartache. When we look to others for self-validation, make assumptions, expect change to be instant or maybe we assign our belief system to others and are disappointed when they don't act the way we think they should.