I feel like you’re mostly right about the overreacting part. There’s probably a little bit of insecurity. I do trust her and love her a lot however, cheating isn’t something I’d ever imagine she’d do. For me the thing is at least, that even if it’s not cheating it still feels somewhat disrespectful to the relationship (at least in my eyes). I don’t mind her friends (in fact I’m friendly with all of them), and I especially don’t mind her flirting or joking with her bi friends. That’s a standard I’m not applying on her even if I do on me. That being said I still feel like those jokes crossed a line, especially since I was there without not knowing how to respond to her friend making them. It was very awkward, and I tend to lean towards the more prudish side when talking with people I’m not close with so the whole situation wasn’t fun for me. I know that the lingerie thing wasn’t sexual in her eyes, but it still feels like a breach of intimacy. As I said, it’s not malicious, it’s not even on purpose, but that doesn’t make it okay. I’m asking here precisely because I don’t want insecurity to cloud my judgement. I don’t want to limit or cause her problems due to me being an idiot and wanted to outside input. Thanks for your reply.