<human>: Can you provide a brief rundown of the text in within 3 sentences?

I have a female friend who I've been really close with for about 3 years. Our relationship did start romantically, but we very quickly realized how great of friends we made. We've always been close and hung out alone and talked about our relationships and truly enjoy each others company in a non-sexual way. My girlfriend of one year got mad at me yesterday for hanging out with the friend which i hadn't done in some time since starting to date my girlfriend. 
    My girlfriend is mad not because she suspected me of cheating on her but because she wants to play the "imagine if the roles were reversed" game, but i keep telling her that we need to focus on THIS situation and why it upsets her and not play a hypothetical "what if" game because there really is no such thing as a perfect comparison to the relationship of the female friend and I. So she just keeps saying "Imagine if i hung out alone with (name of guy she used to hook up with. who isn't and has never been a friend)" worst part is that today is our one-year of dating anniversary and it feels kind of ruined ; (
<bot>: gf is mad that i hung out with female friend. not because of suspected cheating but because she thinks im holding her to some double standard.