My boyfriend logs his insta in my phone whenever we are together to watch it together. Today he did it and forgot to log out. I had the account with me for mins. For context, he has some female friends, that he talks to rarely, like once in few months. One of them is his school crush, with whom he talks rarely, like 9-12 times in last 8 years. So today, i checked his dms, and he talked to her, asked her about how she is, what she does, and did some cheap flirting. He told me that he talked to her, but at the same time he skipped the flirting part. It was really cheap. I read all that. I trust him, that he won't do anything bad, but idk who to trust now. He talked to her once till 3am he told me about this, and second time he talked to her was when we fought. He said things like, there's no one like her here, etc, and flirted. So, what should I do ideally now, should I reveal that I read those chats, or not? Should I just pretend that I did not read and ask him about it innocently next time the topic comes up. I feel bad that I read those, I think that this is one thing I was bette off not knowing.