Masquerade Emotions. “The Mask”, I Know You

It happened in this life that almost everyone periodically tries to hide all the emotions and feelings that are present in his mind at some point.
And it happens that it becomes noticeable to others.
If you notice that your partner or any other person of your surroundings, "put on a particular mask, trying to hide the true feelings and emotions that are present in his soul, in a word, is not honest in communicating with you, how the same should not behave in a similar situation?