What the Bible says about codependency is that our primary source of identity as well as worth and fulfillment should be God, not other people.
And when you prioritize your relationships and seek these things from others instead of God, it can lead to dysfunctional patterns as well as brokenness.
The Bible does not directly use the term "codependency" but instead it addresses the underlying issues that are associated with it and mainly focuses on idolatry and unhealthy reliance on other people.
Codependency, in a biblical sense is seen as a form of idolatry, in which we place another person or relationship in the place of God.
The Bible also clearly states that "you shall have no other gods before me". (Exodus 20:3).
We are meant to find our ultimate security and satisfaction in God, not in the approval or actions of others.
And God created us for relationships, but not for a codependent reliance on other people.
God desires us to be dependent on him for our needs, and then to relate to others in healthy, interdependent ways.
Codependency, though often involves an excessive reliance on other people for emotional validation, self worth and even a sense of identity, which is a departure from God's design.
Codependent people do sometimes have affairs.
Codependency itself does not cause infidelity directly although the dynamics and patterns within codependent relationships can create environments in which affairs can become more likely to occur.
The dynamics also often involve a lack of emotional fulfillment, resentment and also a desire to seek validation outside of the primary relationship.
The impact that codependency can have on relationships include resentment and unmet needs, low self esteem and insecurity, difficulty in saying no and boundary issues, seeking external validation and idealization and fantasy.
Codependents may idealize other people and lead to fantasy crushes or limerence, which can also contribute to affairs.
Codependents also often will rely on external validation for their sense of self worth and if they don't get this validation within their primary relationship, they might seek it somewhere else.
And codependents may struggle to say no and struggle to set boundaries, and it can potentially enable them to engage in behaviors which they may have otherwise avoided, including affairs.
Codependency is also often linked to low self esteem as well as insecurity, which can also make people more vulnerable to seek attention and validation from other people, which can potentially lead to affairs.
And in relationships that are codependent, one partner will often sacrifices their needs to cater to the other, which can lead to dissatisfaction and resentment.
And this imbalance can also create an environment in which the person may seek external validation and connection.