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What does one do? LOLz
Get another girl and make out with her so that the "promiscuous" one can see it. Then start talking to the first one while the other is on your shoulder and then leave and try to make the second girl laugh all the while you are in her view.
This should create jealousy. Then return alone and try to out-alpha the other guy. I usually befriend him and make him want to become my friend and to qualify to me. If he's strong alpha guy like me, I probably have no chance of wining this girl over, but this rarely happen as there are not too many alphas. If I meet a real alpha guy I actually prefer to really befriend him learn from him, but that's another story.
Sometimes I (playfully and overacting it) challenge the girl like " Oooh, you are cheating on me?! My heart is so broken! How could you do that to me?! etc.." they usually respond that I was "cheating" on them first or something (which I usually do, cos' I like to have a massive social proof by juggling 3-4 girls at the same time)
But at the end of the day, why would you care about this particular girl? Just forget her and move on is usually the best and easiest option you have..