Already addressed and explained in the additions made above.Look again.
Man is "Tri-part".
Body
Soul
Spirit
The Spirit is the LIFE, and the actual "inner you" ... eternal you.....that is born again.. "spiritually", or not.
The Soul... is the Mind, Will, and Emotions.......
So, you have the body that contains the Spirit that is regenerated as a Son/Daughter of God and then you have the MIND.. that is the Soul..or the Soul Realm where your thinking and feelings exist.
Thats 3 Parts of a Human...........that correlate to God is 3<>ONE....
God is a TRI-UNE being... He is 3 in ONE.. and because we are "made in God's image".. "Likeness" then we are also 3<>ONE.
Body.
Soul
Spirit
This is likely the verse that you're misinterpreting, to come up with the errant view that we are "tri-part" which, like the "trinity" is found NOWHERE in Scripture:
Hebrews 4:12 For the word of God is living and active, sharper than any two-edged sword, piercing to the division of soul and of spirit, of joints and of marrow, and discerning the thoughts and intentions of the heart.
The "soul" in the above verse is referencing the individual soul (spiritual-Being).
The "spirit" in the above verse is referencing the Holy Spirit, which cuts through all of the nonsense (like "trinity" and "tri-part") like a two-edged sword.