If you don't take a stand, you'll be a doormat forever. Learn to do it while you're with these guys do you know how it's done before it's a romantic relationship. Otherwise you'll end up married to someone who makes your life miserable and you'll have no way out

Fuck those guys. They're not friends. You're only 17, go find new mates

Yep. Dick move. Positive thing is you're 16 or so. This immaturity thing should wear out in a few years. Leave the girl alone. She won't want anything to do with you while she's with the other dude. The only thing you accomplished is that they'll be banging like a drummer in a rock band soon enough- and you sped up the process by forcing her hand.