Cheating on your partner shows that you are holding on to some major guilt if you’ve cheated in real life, or that you may want to do it again, depending on the emotion of the dream.
If you have never cheated then the dream may indicate that you aren’t fully satisfied.
You may want to reevaluate how you feel about the relationship.
If you are dreaming of your partner cheating then there is an unresolved insecurity about the relationship.
Share your dream, get it solved.