I cheat on my girlfriend in recurring dreams.
That's weird. Does every dream involve the same girl?
Yes, I think it's the same girl in every dream.
It's perfectly normal to have dreams about cheating on your girlfriend. You haven't done anything wrong because you aren't cheating on her in real life.
I'm surprised that you aren't worried about it. I hope she isn't either.
I hope so too, but maybe you can explain to her that it is just a dream and you will never do that in real life. It is impossible to control what happens in a dream.