Get used to it, it happens in life.
Bulling other people. Cussing. Hanging out with other friends.
It is quite normal for a friend to talk about other friends and thus, if you have other friends feel free to talk about them. If your friend is simply talking about friends and then waiting for a reaction from you then ignore it. Continue on with your other friends and don't worry too much about this friend and what they want to discuss.
Try talking to he/she maybe you all 3 will become the best of friends
why dont u try hanging out with her and all your other mates at the same time
You leave out the freindship and aviod that person delete them out ur life and star hanging out with other friends
Try to get along, or just pick a fight and get your others on your side, catch him talking smack about your other friends and tell them
Convince your friend to stop doing drugs - if necessary (and you should probably do this anyway) by telling the police - by talking to them without your ex-friends present; it will also help to get your friend doing other things instead of hanging out with the others, like sport or spending more time with you.
Depends on what you mean by choose. If you mean not talking or doing anything with your friends, then yes. If you choose to do something with her instead of hanging out with friends maybe every other time or so, then no.
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Yes, unless he is gay most guys are friends with a girl because they want to get with you but they are stuck in the friend category. Your friend doesn't have the balls enough to tell you. On the other hand how serious are you and your boyfriend? Ask yourself his he worth losing a friend over. Would you want your boyfriend to stop hanging out with his best friend that is a girl?
If your friend is hanging out with other people just let her be. Would you like it if you were just being with some friends and you're other SELFISH friends wanted you to play with them? No. You'd just want to relax with those other friends and maybe catch up on some stuff. So don't worry, if you're friend is a true friend she'll eventually come to you. You shouldn't have to do something to catch her attention. True friends know when they're needed.
Ask your friends to put her in check the next time she starts talking crap, have them push her to tell you. If that isn't an option, or she refuses, or they refuse, your best bet is to point out the next time you two are hanging out that you can't stand people who talk behind other peoples backs. It'll work best if you stop her in the middle of talking bad about someone you both don't like but you've faced and she hasn't..