Quoting Ole' No Name:" What does it mean when you have re occurring dreams of your SO cheating/leaving you for someone else?"
I look the liberty of looking this up on my dream interpretation app. Thank me later
Anywho, according to this app, it means, "that you have underlying anxieties about being neglected and deserted. Perhaps you feel as if your partner isn't giving you his or her complete self. On the other hand, it could also indicate that you don't feel as though you are good enough for your partner. You maybe lack faith in yourself or others. It may also indicate that you sense your companion is not revealing his or her true character or personality to you."