Need advice

What would a neurotypical person think of this? 😅 cuz I’m trying to figure out what’s “normal” and need advice. Sitch: My boyfriend has a female coworker who seemed friendly but turned weirdly cold and rude in the following hang out sessions. She’d take my boyfriends phone when he was showing a picture and not show it to me (when I was sitting next to her) and then she made an odd comment about how she didn’t think I’d last all night partying as if I wasn’t there (again talking about me when I’m next to her). I brought this up to my boyfriend and he said he doesn’t know what to do, he sees her like a sister, and it doesn’t matter what she thinks. But I’m really bothered by it and I’m afraid my OCD is right this time and she/they are doing something sketchy. Am I off base in feeling hurt by her actions and then hurt that he doesn’t seem to think less of her? I’d really love advice.