In this scenario, the dream may actually serve as a reaffirmation of your commitment.
Furthermore, if you are approaching your own wedding date, then it is not uncommon to have dreams about erotic experiences with partners other than your intended spouse.
Most likely, such a dream represents the newness of your sexual passion. It may also signify anxieties of changing your identity - that of a spouse.
To dream that your mate, spouse, or significant other is cheating on you indicates your fears of being abandoned. You may feel a lack of attention in the relationship.
Alternatively, you may feel that you are not measuring up to the expectations of others. This notion may stem from issues of trust or self-esteem.
The dream could also indicate that you are subconsciously picking up hints and cues that your significant other is not being completely truthful or is not fully committed in the relationship.
To dream that your friend is being cheated on indicates your subconscious dislike for his/her significant other. You think your friend deserves to be treated better.
To dream that you are cheating on your spouse mate, fiance, or significant other suggests feelings of self-guilt and self-betrayal.
You may have compromised your beliefs or integrity and/or wasting your energy and time on fruitless endeavors.
Alternatively, cheating dreams reflect the intensity of your sexual passion; you are exploring areas of your sexuality.
To dream that you are cheating at a game suggests that you are not being honest with yourself. You feel inadequate and insecure.