Infidelity is a betrayal of a relationship. And infidelity is a leading cause of lost friendships, breakups and divorces. Infidelity is not just about being sexually unfaithful. Infidelity is about any discontinuation of loyalty or support. And lack of allegiance. See where this blows the doors wide open for confusion? Infidelity is completely subjective. Some people have a very strict definition of fidelity and some have a very liberal definition of fidelity. It is based on belief systems, past experiences and education with regards to morality and personal preferences. If we witnessed or experienced infidelity in our childhood, we will most likely not even recognize the ways we lack fidelity. It will be a huge blind spot.