K I know you said not to judge, but this makes me think of my horny grandfather-in-law that has too big of a thing with much much younger girls. I would say from a general standpoint that most likely you are being used which you knew and yes it is cheating. How would you feel if you were your aunt? Not only are you doing this with her husband, but you are family. Some would see that as more the betrayal than had he simply been cheating. Especially when you came back and apologized. Just my thoughts. I'm frequently wrong