With the guy, I would just talk to him about it and tell him he's crowding you a little too much, and you're not trying to be rude, but you just need some space. If he's calling you all the time, just let him know you can't talk all the time, so if he could call you less, please.
And your friend is slitting her wrists because he's stalking you, or because you like him? I would have a serious talk with her anyways no matter what the reason because she's inflicting serious pain onto herself and she is hurting her body very badly. Let her know she's scaring you by doing this and that you're worried for her and her health and everything, and that she needs to stop. Even get her parents or some adult in on it to try and help her out if she refuses to stop and denies she has a problem. Cutting is a serious thing, and it needs to be stopped now before it gets too serious.
If you want to IM me or message me back with your situation, I can try and give you more help as to how to talk to her and everything.
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