I need help with a friend. It'll mean so much to me if someone helps.?

My mate (s) met in 4th grade we were best friends we did everything together, me and my mom emigrated then came back we decided that we wanted my dad back. He wouldnt take my mom back but was happy. We had no where to stay so we stayed there for a couple of moths then my mom got a house. In that time she was still great mates with me. Then my dad got a girlfriend. She hated me and my brother. She abused and ignored us and took my dad away from us. Her daughters did Voodoo on me and one pushed me down the stairs i started to cry because i hit something sharp and under my arm it was all bleeding and cut open. My dads girlfriend told me to live with it. I ran home got my knapsack and ran back to my moms.blood all down my top and no one there. My brother ran after me and cuddled me and he picked me up and took me to my moms. He called her and the ambulance came for me because i neeeded stictches. My mate wasnet there for me then. Then when we both arrived at Highschool i met lots of friends and so did she my friends me and her mates and her were all bets mate. Then someone close to her died. She was devestated. Then she got into lots of cles over it. She hasent returned since to school. This was in 7th grade.. were now in 9th grade. We've kept in touch, but shes totally changed. Died her hair, shes a compleate goth. She slits her wrists and im always there for her. She turned all my mates against me over MSN. Then i saw her face at school once! She and me made up friends. I was always there for her all of the time. Why was she never there for me. I was badly hurt after my dads girlfriends daughters did that. My dad wasent really the problem i love him to bits. But he accused me of calling his girlfriend a . I didnt at all. but he wouldnt talk to me. All my other mates were there but not here. My dad got a new girlfriend. Shes really nice and i really like her. She pays attention to me and my brother and my mom. Shes so nice! I got the news a couple of days ago that shes moving school. I feel so empty now. I want to crawl into a hole and cry. Im really upset i love her to bits as a mate but im so mad at her because she was using me pretty much all the time. how can i get through this? Im deeply hurt and i dont know why?