Negative emotions

It is important not to repress our negative emotions. If we feel angry toward someone, we can refrain from expressing it to the person, instead finding a sympathetic friend and telling him or her about it. This will allow us to exorcise the negative feelings in a nonharmful way. (Gill Farre-Halls. Buddhist wisdom)

Right speech

If you know anything that's hurtful and untrue, don't say it.
If you know anything that's helpful and untrue, don't say it.
If you know anything that's hurtful and true, don't say it.
If you know anything that's helpful and true, find the right time.

                                       Shakyamuni Buddha