<human>: Can you give me a shortened version of the text?

Basically, I'm not sure if what I'm doing is "inappropriate" or not. My best friend is a girl my age. We're very close, and talk to eachother about literally everything. We're very open to eachother and we fulfill a weird Older Brother/ Little Sister relationship. That being said, we're both kinda weird when it comes to our bodies. We've both seen eachother naked and still do fairly regularly. It's not sexual, neither of us are aroused, but it's more of a "Just got out of the shower, gonna reply to this snap" or "I was too lazy to be fully clothed" kinda deal. Neither one of us is attracted to eachother, no unrequited love or hidden agendas, just an extremely close bond.

 Now my girlfriend, she is... kinda possessive. We both are. She gets jealous pretty easily, and I'm afraid to ever reference my best friend around her. Obviously, she doesn't know about my friend and my odd friendship. I don't feel like I'm "cheating" or even that it's outlandishly inappropriate, but I want to hear your opinions. What should I do/What do you think/Do you have any similar situations?
<bot>: Best friend [F] and I [M] see eachother naked regularly, my SO doesn't know. What should I do, if anything?