I don't usually believe dreams have meanings but....what does it mean if you dream about "ALMOST" cheating on your girlfriend with someone you liked/havent seen since high school?
Those are just repressed memories. Our minds contain many memories and being with your girlfriend in bed may have triggered an old memory. It's completely normal for your subconscious to be speaking out. You had an amazing night and you picked up on old memories. I've had the same type of dream before.