Dear Steve and Shirley, about 2 years ago I messed around with my sister’s husband after a drunken night out. I made him swear that nothing would ever happen between us again. We managed to stay away from each other but he would text me often, begging for just one more night with me. He would tell me how sexy I am and I’m the best he’s ever had and he’s with the wrong sister and all of that......................