Emotions cannot be permanent. That’s why they are called “emotions”–the word comes from “motion,” movement. They move; hence, they are “emotions”. From one to another you continually change.
Intense emotions have been likened to an ocean wave. They crash over you and may knock you off your feet, however, just like a wave, they always recede. Learning to ride these waves of emotion without “acting out” is a necessary life skill.