Aye, I had a similar situation but I was older...only by about 4 years, but trust me that makes a big difference. Best thing you can do is try to put her out of memory, and if your friend Ben did kinda screw with her behind your back...well he wasn't really in the wrong but it still is a shitty thing to do to a friend. Even if she's an ex, your friends should not be the ones to rebound on your ex...

Bros before Ho's is a motto people around where I'm from seem to live by (the good ones).

Life will go on, and I think I read you are planning on starting college soon. Your life will change in ways you cannot even comprehend yet if you plan on going, chances are you will look back on your life at your senior year of college (when that day arrives) and marvel at what happened, it'll be all good.