This is a simplified rule but it works. The fist 10 years of your life your mind is in the “being molded” state. What the mind does is receive all kinds of information from it’s invironment without really questioning the validity of that information. Patters of thought are established here and they create patterns of emotions that continue into adult hood.

My experience has been that in most cases, what a mind does not get in these stages it demands in a later stage. At age 30 we can tell what a person did not get in development of it’s mind by the way a person behaves.

In broad terms, might say that when someone “just can’t live without you” it means that they did not learn how to self nurture as a child. How to take cafe of their own needs of being alone while growing up. We could say, and not always, but we could say that when someone is “needy” that neediness could be because the brain didn’t get it as a child. When someone only feels loved when you don’t argue with them, then they didn’t learn that arguing is part of life and negotiating and solving issues in a relationship isn’t about peace