If you dream that your partner is being unfaithful to you, means that you feel very insecure about yourself, or have the trust issues with this particular person. Sometimes the infidelity dream could represent the lack of time you are spending with your other half and do not feel satisfied in these kind of relationships. You feel jealous that your partner is spending time on his/her own or with other people. If there is someone else who betrayed you in the dream, but not your partner, it suggests to be aware of that dream, because the subconscious mind is giving you a signal do not trust everyone. The infidelity could also represent you, the things you promise yourself to do or not to do, but it doesnt happen.
Read more about dreaming of Infidelity in other dream meanings interpretations.