<human>: So after googling the topic of staying friends with an ex while still dating, I didn't find much since so called "relationship experts" aren't credible. So I came to reddit for popular opinion on my situation.

For some background info, my gf and i have been dating for just about 3 months. We both are each other's second relationship. Her breakup with her ex was very controlled and a good breakup. They dated for 2 years and they broke up mutually  because they both felt like it was not going anywhere. However, with my relationship, my ex an I dated for 2 years too and broke up because she wanted to date someone else.

Now my ex and I rarely talk, and the only time we talk is because we have a mutual friend group we share, and we sometimes see each other during hangouts with them. Also my ex has a bf, so another reason to not talk to her.

My gf and her ex talk regularly, and sometimes hangout once or twice a week. She assures me that she is just friends with him. But I suspect that her ex wants to get back together secretly.

I trust that she won't get back together with him and she has told me that she doesn't want to get back together with him. But i cant help but feeling uncomfortable and a little insecure when they hangout. For example just the two of them are at the mall shopping for school stuff.

Right now im conflicted with whether I should get her to cease contact with her ex or at least see him less, or if I should just push this aside because I'm being too insecure.

Can you give me a shortened version of the text?
<bot>: my gf is friends with her ex while dating me. They talk weekly, hangout sometimes. Am I being insecure, or should I do something about it?