My best friend- self harming to the extreme....?

My best friend (whom means more to me than anything in the world) recently has split up with a boyfriend. She's had a past for becoming infatuated and obsessed with boys- she stalked and obsessed over a boy who didn't like her back for years etc etc. She'd never had a boyfriend before and now he's broken up with her she feels like she cannot be happy without love- she needs it and I quote 'I think I'm going crazy. Noone needs love as much as this- this isn't normal.' She tells me that she's been feeling extremely lonely and now she has a huge amount of cuts on her wrists- I'm not a cryer but I cried so much at seeing this.. and her explanation for this was 'I just wanted to see my blood, it's so weird and lovely it being all inside of my body.' Please please please tell me what's going on with my friend and how I can help- it's killing me because I love her more than anything. Thank you.