To me a healthy relationship that is based on a soul connection has the following:
Will be attracted to each other from a soul level rather than just the physical or mental level
Will not need or want to change the person or make them "better".
No attempt to control or manipulate
You maintain your own individuality and feel free to be your authentic self.
You inspire and empower each other to be the best versions of yourselves.
No emotional neediness or seeking for approval.
Feel safe to be vulnerable with each other and support each others expression of emotions with compassion.
Passion and intimacy - sexuality is a very important and crucial part of a relationship and a way to connect more deeply physically, emotionally and spiritually.
This is a beautiful written poem by the prophet Kahlil Gibran on marriage:
You were born together, and together you shall be forevermore.
You shall be together when the white wings of death scatter your days.
Ay, you shall be together even in the silent memory of God.
But let there be spaces in your togetherness,
And let the winds of the heavens dance between you.
Love one another, but make not a bond of love:
Let it rather be a moving sea between the shores of your souls.
Fill each other's cup but drink not from one cup.
Give one another of your bread but eat not from the same loaf
Sing and dance together and be joyous, but let each one of you be alone,
Even as the strings of a lute are alone though they quiver with the same music.
Give your hearts, but not into each other's keeping.
For only the hand of Life can contain your hearts.
And stand together yet not too near together:
For the pillars of the temple stand apart,
And the oak tree and the cypress grow not in each other's shadow.