<human>: Last year I had a good friendship with a girl (F) at my university. We spent a lot of time together and were very comfortable (without any sexual element) with each other. I ignored her more manipulative and selfish side because we had such a good time, and because it mostly didn't effect me.

This year I met my current girlfriend (G) and immediately we started a relationship, which is perfect in essentially every way. We rarely fight, we enjoy all the same things, we're sexually very good together, we get along incredibly and we can talk forever. She's utterly beautiful and we've started to say that we love each other.

G gets along very well with all my other female friends, and at first was really excited to get to know F, but over a couple of weeks became really uncomfortable when F was around. I could see why. F was so pleased when I got with G that she decided to try to become best friends with her straight away, and in trying became way too familiar with her, jumping to topics that G wasn't happy talking about. G started becoming quieter and quieter whenever F was around.

There is another side to it, of course, which is that both G and F are very attractive girls, and very aware of it. It's possible that both feel threatened by the other. Adding more issues, F is a very touchy person (with everyone) but doesn't seem to tone it down when G is around.

G has now started avoiding F entirely, and will find an excuse to leave with F is around. She's told me how unhappy F makes her, which I didn't entirely understand but since talking to another good friend I get that F can be a profoundly threatening person. G has never tried to stop me seeing F, but merely stated that she will try not to have contact with her.

I can tell that my friendship with F is really making G unhappy, and is really adding to her stress from university. Apart from explaining to G that I have no feelings for F, and that she is in no way threatened by her, how can I help her feel better? I'm not going to stop seeing F because we've been such good friends in the past.

Can you succinctly summarize the text in 1-3 sentences?
<bot>: Friend and Girlfriend can't get along, stressing Girlfriend out! How can I help G become comfortable in at least my relationship with my friend?