Self-esteem is the subjective evaluation of your own worth. There are two sources to fulfill this need:
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Those who have fulfilled their needs at the lower level will try to level up and also fulfill their needs in the upper levels.
Self-actualization is the realization of one's uniquely creative, intellectual, or social potential. It is a very personal experience.
When their need for self-esteem is fulfilled, where they have accepted themselves for the good and the bad, people move on to self-actualization.
Romantic relationships have the extraordinary potential to expand our selves.
They create a 'role engulfment' where one's identity is based entirely on one specific role of being a good lover/partner. It is conducive to one's growth and health and eventually applies to the self, and one starts to help others selflessly.