AITAH for cheating on my girlfriend in a lucid dream?

I'm not accustomed to lucid dreaming but at one point during my dream last night I realized I was in a dream. At first I was going around intentionally agravating people and their lack of reaction made me become aware that I was in a dream. Then a girl who looked nothing like my partner started flirting with me. At first I walked away but then she asked for my snapchat and so I turned around and gave it to her. Next thing I know, we're kissing and then having sex. I remember being aware that I was cheating but also that it was a dream and so it wasn't real and so I continued. I don't think I could tell my partner this because she would be heartbroken. AITA or is this just how some dreams go?