Should I say something or just stay out of it?

Anonymous
So one of my guy friends has this huge crush on this girl who I am sort of friends with but the thing is, she uses guys like tissue when you have a bad cold. Plus she constantly has guys chasing after her so she has extremely high standards and my friend doesn't exactly fit these extreme standards. So she constantly flirts with him and has him doing ridiculous tasks like going to detention with her and stupid things like that for maybe a hug in return or something. The problem is once she gets bored of him she going to break his heart like she does with guys all the time (and I know for sure she will because she told me she would) I don't want him to get hurt so should I say something or let him learn his lesson?
Should I say something or just stay out of it?
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