In life we face lot of situations where things would not happen according to what we anticipated or worked hard for.
When this happens we get disappointed. Human mind is a very beautiful place, consider disappointment as source of waste. Now would dirty a beautiful place called mind with a waste called disappointment?
The answer should be know if you want to be a peace loving healthy minded person. Now imagine you did not clean your mind and left the dirt as is. What happens over time?
The dirt would pile up. Naturally it rotten (spoil your thoughts) and hence start decomposing (your behaviour is affected in a negative manner)
So how to clean this diet called disappointment? I would say throw (speak out or work hard to achieve success)
Opening up yourself helps a lot in cleaning the mind. It also helps others understand you better and act accordingly.
If the disappointment is due to failure in achieving something then focus on working harder plus smarter in realising your dreams or goals.
But if disappointment is because a person then never keep it within you. It would lead to higher levels of emotional stress like depression and anger towards that person. This may be very bad allowing you to think in ways that defies your basic or original personality.
Be happy and try to bring smile on atleast one person's face everyday.