What in the world should I do, really need help here!

Okay, I have a friend, and she has went out with my cousin, but then she broke up with him bc she didnt like him, now they are going back out again! And she is 15 and has madeout with all of her brothers 17 year old friends! Her latest ex boyfriend's...

name was ethan and she broke up with him bc she ecused him of cheating, when he swore he was in love with her, now he is really upset...and my cousin is happy, my cousin is also like a brother to me and we are born exactly a month apart, but I really want my friend and ethan to get back together! What should I do?should I break up her and my cousin to get her and ethan to go back out, or should I let ethan remain heartbroken...which is 100% that he didnt cheat!

Let fate go its own way! If its meant to be it will be, that's something to always remember. Let it work out its own way, karma will get your friend eventually for the damage she causes but till then just let it go its own way!

I say just kill the girl.

bahahaha "funadvice" nahh, I think that you could try talking to your friend, but dont try to break her up, that will only make her mad at youuu.. talk to her about how you feel, she if she can see where you are coming from, rember its her life, not yours, so you can try to help all you want, but she has the ultimate say in the end..
good luck, let me know how it goes