Split up with my gf yesterday she wont let me go?

me and my gf was 19 and was together around 3-4 years well we split up yesterday due to constant arguements but we love eachother, we were talking on msn and we said that we be mates but i blew that i asked 4 a naked pic to remember her she went off on one. I have cheated on her in the past so she told me she cheated on me she said she sed it for a joke because she was mad and it happened before we got together wen we split up for 8months but she hasnt slept with him but wen she told me i called her a tramp, s**g and a acholic which she had a problem in the past i did say sorry when i called her that and she said if i loved her i wouldnt of sed it i have told my mum to text her saying i dont love her anymore and i have moved on but she begging me to talk to her, i am meeting a girl tonight so we might get together but cant if she is around also my ex has sent me loads texts saying she wants to die and i think she will go do something stupid could some1 help me please and what to do.