Me (27F) met my husband (29M) while i was in college. We were in the same school but he was my senior. We fell in love not long after we met. Things were going great, so we decided to get serious about our relationship and met each other’s families. I didnt really like his family but he got along with every member of mine. Last week, we had a family dinner at our childhood house. After dinner i was wandering around the rooms, remembering the old good memories we had. I was checking out my sister’s room and found our old photos. I was happily looking at the photos of us until i found a photo of my sister, with my husband. But the photo clearly wasn’t recent. It looked like my sister was in high school so it was almost 10 years ago. The photo wasn’t something inappropriate or anything but if they already knew each other, why didnt they tell me? I dont think they are on bad terms because they get along together at family dinners. The day passed and o was still thinking about the photo. I finally found the right time to ask my husband about my sister. I asked him if they met before but he told me that they didnt and this question was out of blue. Then i told him about the photo i found. That was when he finally told me that they we’re friends in high school but nothing more. I felt relieved that he finally talked about it but him lying to me about this really triggered me. But i just shrugged it off because its my sister and my husband were talking about here. We went out for dinner a few days later. He went to the bathroom and left his phone there. He started getting a ton of notifications but i didnt look at them because it is ‘wrong’. But they just kept coming so i couldnt take it anymore. They were all from the bank, they were telling him about the purchases he was making right that moment but how could that be? He was having dinner with me. There were a lot of Make-up products, expensive clothing and more.. I knew something was up. I put his phone back and acted like i knew nothing. The night was so bad, sleeping beside him with doubts about him was the absolute worst. The other day i met up with my sister to ask a piece of her mind. I told her everything, waiting for a response but she just looked at me. This made me uneasy and then after a moment of staying still, she told me that she was the one making the purchases with my husbands credit card and that they have been having an affair for a while. I was in shock and i just walked away. She tried calling me and texting me that she’s sorry but i dont know what to do.