Happens every day. I had a friend in school who only went out with guys I had crushes on....and we stayed good friends! The girl had no taste of her own and so started to like the guys I advertized. Just be cool. There's a million fish in the sea. Really!
Steal her away<br />
use her up<br />
dump her<br />
he'll take her back <br />
everyone is happy
At your age, they'll probably break-up in two weeks then you get her for 2-3 weeks and so on !
You should forget about her because you may just cause trouble to her and your friend. If you can't move on then your going to suffer. So move on! Plenty fish in the sea.