The integrity of an intimate relationship is based on shared values which are faith and trust. When these values are breached or violated by being unfaithful to your partner in a sexual or non-sexual way, it is called infidelity. The understanding of infidelity is quite blurred as some may not consider “emotional infidelity” as a breach of trust but it actually is. Both physical and emotional intimacy with somebody other than your partner is infidelity.
Physical intimacy or sexual relations outside an intimate relationship consists of distrust and betrayal. While emotional intimacy can be emotional dependence where quality time, attention and romantic love is spent with a person with whom you are not in a relationship with. In both the cases the other partner in the relationship is cheated and betrayed accounting to infidelity.