I’m looking for feedback and how to forget a relationship mistake. I just got out of a bad marriage. I met a girl that also just got out of a bad marriage. She had a “sex buddy”, with which she had just started to meet. They would just text each other and meet at a hotel. They never went out on any dates. The day we met, she stopped communicating with her “sex buddy”. We went out four times, and then I was out of the state for about a month. We text and spoke several times every day. While I was out of state, I told her I was going on a quick trip, with a girl, but nothing was going to happen. She told me not to hurt her. I told her I would never hurt her. She didn’t believe me and had sex with the “sex buddy”, the day I left for the quick trip. Soon after I got back from out of state, we became a couple, and two months later moved in together. That is when she told me all the above. I knew nothing at all about the “sex buddy”. When I was upset that she had sex while I was gone; she said it was just insurance, so she wouldn’t get hurt. She said we were not a couple at that time. I had been gone for over a month, and she was not sure I was even going to return. And if we were a couple, I would never have gone on a quick trip with another woman. She showed me their text. She text him hello, he text do you want to meet, she text yes, he text her the room number, she text back be there in 10 minutes. Looking at time stamps, it looked like a business transaction, and she was really in the room less than 30 minutes. Then looking at her facebook checkin, she went and got drunk. She said she wanted to forget me. She said the whole time in the hotel room, she thought about me, and she was angry. She said she was wishing it was me and not him. But I was not there, I was with another woman, and she was extremely hurt. The day I returned from out of state, she text him that it was over and to never contact her again. She deleted any trace of him. She deleted him from facebook, phone contact, and everything. We have shared phones from the day I moved in. I use her phone to send text at times, and she uses mine. It has been almost a year. And I know she has had no contact with him. It happened while we were dating, and we were not an official couple. So why do I think of that one day, the room number, and hotel name, 100 times a day. I really don’t care about the times she was with him before we met. But that one day keeps me from sleeping at night. What do I need to do to get past that day? I do sometimes wish I had had sex during that time. Then maybe I could get past it. It really is just that 30 minutes I can’t stop thinking about. She has told me every detail of it, and answered any question I have asked. We are talking about getting married, and I really need to get that day out of my head forever. Please help