Dream about partner being with someone else symbolises getting things done. You have done something that you are not proud of. You feel that you are not yourself anymore. This dream is sometimes boundary between your conscious and subconscious. You need to be lighten up.
Partner being with someone else dream is a premonition for alertness, awareness, open communication, reason and versatility. Perhaps you are trying too hard to impress others. You are in denial. This points to your daily routine. You have set your sight on a goal or path and are taking a firm stance on your beliefs.
If you dreamt about partner being with someone else:
Somehow it seems that today, you will have a better understanding of the intricacies of a certain relationship. If you have been jogging along fairly contentedly, yet have recently had the feeling that the relationship contains far more potential than you are both currently aware of, then it may be time to take action. Arrange new activities or do something different - anything that will awaken you both to greater things.