There are three main reasons why someone you just met feels very familiar: past lives, soul agreements or contracts, or they are part of your soul family.

You Shared A Past Life (or more)

The soul that is the inner, eternal, part of you lives many many lives in physical form as a human being. In your different lifetimes you encounter many people.

After many lifetimes, souls tend to agree to encounter some of the same people lifetime after lifetime. These souls become “old friends” who assist you to experience various situations that you as a soul wish to explore.

When you meet an “old friend”, you naturally feel a resonance from those previous lifetimes, so that person feels familiar to you, as if you had known them all your life.

You Made Soul Agreements Or Contracts

Oftentimes, souls will make agreements with other souls to perform certain tasks, or to assist with certain situations that the soul wishes to explore. When you encounter someone with which you have a soul agreement, that person will feel familiar to you.

Soul agreements are most often made with other souls with which you already have familiarity from a previous lifetime, so you will feel an added sense of having known that person before.

You're In The Same Soul Family

Each of us humans is part of a group of about a thousand souls that emerged into being at the same moment we did, called a Soul Family. There are hundreds of thousands of Soul Families around the world.

Your Soul Family members are your spiritual family—when you meet someone from your Soul Family, you will likely feel a strong feeling of recognition, as if you knew that person before you ever met. 

Your Soul Family has a specific energetic characteristic that influences your personality. All your Soul Family members will have the same personality characteristic, which adds to the feeling of recognition and “family” when you meet.