I [18F] got upset at my fiancé [20M] for leaving something his ex posted on his steam comments up. We get into an argument and he brings up how I was speaking to my ex the very first month of our relationship (keep in mind I wasn’t sure that he was okay with me being friends with an ex, and even then we weren’t officially a couple as far as I knew, he never popped the official question) and I get upset at him for bringing it back up because I was genuinely oblivious to what was okay and what wasn’t at the time. So AITA?