Girls, Could you ever sabotage your friends or colleagues out of jealousy?

Picture a scenario like this:

A very attractive man (who you do not know personally) has interest in your friend/colleague. He can tell that you are connected to this interest of his, and he asks you to act as a go-between between him and her and relay a small letter with his contact info on it to her. His plan is to be very subtle: if she doesn’t call him back after receiving the letter, he can simply walk away without losing any face, never to see her again.
Now, let us go back to the main question. After he has entrusted you with delivering this letter of his, would you see yourself, or some other person of a very jealous type leaving the letter deliberately undelivered so that your friend/colleague doesn’t get to have this man for herself who you consider very attractive?

Girls, Could you ever sabotage your friends or colleagues out of jealousy?
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