So for some context, my girlfriend and I have been dating for about 10ish months now. Way earlier even before we started dating, she told me she had 1 ex from a couple years ago, one of her closer family friends. My problem isn't that I think she'll cheat (I have full trust she wouldn't cheat). Anyways, her family and her ex's family have been very close family friends for years. Now that they're at lot older, they work together in a cultural group and work on the same team, so they stay in touch often to communicate whatever they need to. But any time she talks about him she always says she didn't truly like him and honestly hated talking to him.
Deep down I have no problem with them working together, I've personally never met him but I know there's nothing between them. Sometimes I just get a little insecure/uncomfortable (I have voiced this before) whenever she mentions the next time she will or the last time she'd worked with him. It usually passes within the hour, sometimes the day. I guess she just always has seen him as just a family friend and even more now than ever which is probably why she talks about him so casually. But any advice on how I can feel less insecure about this? Any help would be greatly appreciated!