Mix dreams

Does anyone know what it could mean? Ive been having dreams of my SO cheating on me or of us arguing about it. I know it can’t be true because he has shown me that he isn’t about that life especially because he believes in karma and knows what goes around comes around. But it is extremely weird that i have these kind of dreams. Especially because they feel so real. To the point where i wake up not know it was a dream if that makes sense. I’ve even woke up crying once. Does anyone know why i could be having these dreams? 😕