So I (20f) and my roommate (19f) moved in together almost a year ago after having been best friends for most of our lives (I know a million people have told me that was my first mistake, that's not what I'm here for). Everything was fine for the first 6 months until she started seeing her now boyfriend (20m). They were ok at first, but for the last few months, they haven't been spending a second apart and there has been several times where he was in the house when I hadn't been told and he almost saw me n*ked. There's been times I thought I was about to have to fight off an intruder because she didn't tell me he was staying the night. Now, a month before she started dating this man, I started dating my, now ex, (22m) we'll call s for the sake of the story. I always went out of my way to make sure she was OK with/ asking if he could stay over/come over just so she would know he was there, not once was he ever in our home without her knowing. Now I know we're both grown women and I'm not her mom so she doesn't have to tell me who she has over, but this is just to set the scene. Now my ex and I broke up about a week ago and 2 days after we broke up, my roommate's bf texted S to see if he was OK (they had no prior relationship to eachother before their relationships with us and formed almost no friendship while we were together) and after talking, invited S to start playing dnd with him, my roommate, and their friends at his house. Now the roommate's boyfriend had made zero effort prior to us breaking up to bond with, talk to, or even try to make friends with S until that moment, so, AITA for feeling like it was a blatant jab to disrespect me? Or am I overreacting?