A "soul tie" is a mystical bond between two people. The phrase is used to describe love at first sight or an obsession that is so strong it feels like two souls are entwined. The concept is also used to justify an ungodly relationship.
Soul ties – What does the Bible say?
The Bible does not allow for the existence of a "soul tie." Genesis 2:24 says that a married couple become "one flesh," not one soul. Jesus said that there is no marriage in heaven (Matthew 22:30), which would not be the case if people were joined in their souls.
What we think of as a "soul tie" actually may have more to do with the sense of smell. The closer two people are, the more they get used to and develop an addiction to the hormones the other naturally emits. Dopamine, norepinephrine, serotonin, oxytocin, and vasopressin all combine to make us "feel" in love. God allowed this so that married couples develop even closer relationships.
Another possible source of the feeling of a "soul tie" is a psychological obsession. Romantic obsessions are based on what we think of the other person. This does not necessarily have anything to do with reality; and it's foolish to expect someone to be what we want them to be rather than who they are.
A close relationship can feel like a "soul tie." But even the closest relationship based on personality and mutual love does not mean the two souls are entwined. Sometimes the concept of "soul ties" is used as an excuse to indulge in an ungodly obsession. Feeling like your soul is tied is not an excuse to stay in a relationship that is unbiblical. And it is not some insurmountable force that constrains us to sin. It's just an excuse to stay in sin. Instead of using "soul ties" as a rationalization, we should deal with the sin (1 John 1:9).
The only soul we are tied to is that of the Holy Spirit. If He indwells us, He is entwined with our soul. All other relationships, no matter how close, are a combination of physiological response to chemicals, mutual interest, natural affinity, or sinful obsession.
Do we have a body, soul, and spirit? Are we made of two parts or three? Dichotomy or trichotomy?
In marriage how do the two become one flesh?
What does the Bible teach about marriage?
When do we receive the Holy Spirit?
Superstitions – What does the Bible say?