The Buddha's Noble Eightfold Path is divided into three divisions. Wisdom, Morality (Ethical Conduct) and Concentration. Right Understanding, is the first element of the Noble Eightfold Path and is related to Wisdom together with Right Thought.
Right Understanding starts with acknowledging The Four Noble truths and gaining a profound knowledge of these truths. These are:
Buddha says that Right Understanding implies that we Trust that eventually we are capable of transforming our Suffering and hence obtain Happiness, peace and pleasure.
The Noble Eightfold Path of Right understanding is being able to make a clear distinction between positive and negative influences. If you are a loyal person this means that the seeds of loyalty are within you. However this does not imply that the seeds of treason are not present at the same time. Understand that both are present and that one contributes to Suffering and the other contributes to Happiness.
Your environment will have a big impact on which of the two will be nourished. If you give water to the seeds of loyalty, loyalty will grow. If you give water to the seeds of treason by watching movies, reading books and listening to stories about hatred, treason and betrayal these seeds will grow.
Acknowledge the existence of treason and its origin, for instance watching movies about betrayal. The next step would be to refrain from watching these movies and to cultivate the seeds of loyalty by watching movies about loyalty. Practice this element of the Noble Eightfold Path, which leads to less Suffering. Be the Buddha