ex girl friend messaged me asking if i was flirting with her friend on facebook, what is that about?

[Charley]

If you want to get her back? Then the correct response is to make her jealous as possible. Do this by evading the question while snubbing her.

Say "don't worry about it" or "you're not a factor in my life anymore. If I talk to a girl she's not *your* anything".

This will make her super jealous and she will try to win you back.

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But if you don't like her and don't want her back, and simply want to minimize drama/want to bang her friend?

Then the correct response to say is "no, what?"

Cuz either way she's gonna go to her friend. If you say "no" her friend will get super jealous when she hears you denied her, and will want you. Or if you say don't worry about it, your ex girl will be jealous.

So play your answer depending on your goals