My boyfriend and I have been together since February and the first month or two of being together I could tell he was hiding something... I found out someone he was telling me was his cousin was actually a girl he was using for her car, food and money and he said they never did anything. (we’re in college not saying it’s right). Well I did some lurking on her social media because I still felt like it was more than that and of course I was right. I saw videos of them in bed together, a picture of them at a hotel together (we were together during this time), and just her talking about him. She called all the time until he blocked her a few weeks ago. It just hasn’t been sitting right with me and on my mind a lot.So how do I bring this up without seeming crazy?