<human>: Been dating a few months but we've confided in each other that we want this to be a long-term relationship. She lives about 2 hours away and we see each other about every week or two. Both of us dated our exes for most of college and are on good terms with them now. We both talk to our respective exes more or less every day. Her ex is dating someone (kind of) and my ex has also been dating around. 

My ex and I broke up about six months ago. She lives in the same city as I do and we share many of the same friends and interests, so we've hung out (in group settings) numerous times since I started dating my current s/o. 

My s/o and her ex broke up about a year and a half ago. He lives in another state, but she's gone to visit him several times. They've also slept together every time they've seen each other since they broke up, the last time being about a month before she and I started dating. They haven't seen each other since then.  

Is it weird that we're all still so close? I know that I have no romantic intentions with my ex, as we were friends for years before dating and I very much value her friendship. I've brought up with my s/o that I worry at times that she might still have feelings for her ex, but she assures me that this is not the case (they were also good friends before they started dating).

Am I being crazy here? Am I just pushing a double-standard on her? I know it really comes down to just trusting her, since she's never given me any reason not to. I guess it just gives me anxiety because they hooked up so recently and I know they're going to hang out again at some point.

Can you summarize the given text in a few sentences?
<bot>: GF & I are still best friends with our respective exes, but I'm worried about what goes on between gf+her ex and also what's gonna happen when they hang out again.