I have my boyfriends card details and he has mine, and he has said to me in the past i can use his card for things i just need to ask first. He recently got a new card and the details changed, and I accidentally tried to use the old card details without asking first. His bank asked him if it was him, because it flagged up as a denied purchase, and he asked me and I didnt want him to get mad at me so I said it wasnt and now his card company is investigating the ‘fraud’. i know im a s***** person but its gone too far and i can’t sleep from guilt.