I don't think it's your english; I understand you fine. Perhaps this forum is more for people trying to save their marriages.
You are still thinking in terms of what you can do that will affect or control your GF. Focus on YOU. Stop interacting with her, except for polite conversation. Do NOT discus the relationship.
I don't think you should be raising your voice at all. You should instead be calm, collected, and too busy to deal with her. Everything else you are doing is confirming her reasons for leaving.
Hang in there!
M:42|W:40|D:17|S:13|Bomb:10/23/09 Awoken's Current Thread