Is that this the nature of  girls‘ nature?

For a long time, I've been wondering how to perform act [不能用此句, 意思是当众場面與她在性交!]during a party with my girlfriend and my good friend who is a girl.

I can only think of image imagine two results:

If I do not talk with my female friend, then my girlfriend will ask me:"Why don't you talk to her? Are you trying to conceal anysomething? There must be something going between you two can't tell!" War breaks out.

If I do have a talk with my female friend, and my girlfriend will complain:"Why are you two can chatting so sweetly? [or "... so chitty chatty"] I'm right here by your side! What will you do then when I'm not here?" War breaks out.

Is there anybody who has Do you have the same scenariofeeling?

(CAN U HELP ME CHANGE THE WORDS INTO A NATIVE ENGLISH ESSAY?) [No need to shout :)]

Can you help me express in a more native way?  Thanks!

If I were you, I just go and talk to the guys.  If your girlfriend says why aren't you talking to me, you can reply, "I'm gay because you are asking stupid questions!]

Is that girls‘ nature?

For a long time, I've been wondering how to act (perform) during a party with my girlfriend and my good friend who is a girl.
I can only imagine two results:
I do not talk with ('to' sounds better, although 'with' isn't technically wrong) my female friend, then my girlfriend will ask me:"Why don't you talk aren't you talking to her? Are you trying to conceal anything? There must be something you can't tell aren't telling me/can't tell me!" War will break out. (I like that phrase!) 
I do have a talk with my female friend, and my girlfriend will complain:"How (why) can you two chat so sweetly? I'm right here by your side! What will you do when i'm not here?" War will break out.
Is there anybody who has the same feeling feels the same way-(a more natural way of saying it :-))?

(CAN U HELP ME CHANGE THE WORDS INTO A NATIVE ENGLISH ESSAY?)