In terms of not being over your boyfriend, especially since he broke up with you, it’s natural for you not to be over him. You still had feelings and it will take some time for the feelings to fade away. Try not to dwell too much on the break up and go out with your friends. You may have given up all your friends for this boy, but you can still go apologize to them and ask for their forgiveness. No one likes being left behind when a boyfriend or girlfriend comes into the picture, so your friends are probably a little hurt about that. Just say you’re sorry and try and try to repair those friendships before it is too late. As for the girl threatening you, you need to report that to an authority (principal, teacher, or parent) because that is not only wrong, but it is illegal.