I just made a huge mistake. I accidentally saw my girlfriend meeting in a pub with one of my friends when she told me she`s working late. When she got home, I asked her about her day and she didn`t say anything about meeting my friend. So when I told her I know everything and want to break-up, she said she was meeting him to plan my surprise birthday party. I`m very paranoid, so it seemed just like a very convenient excuse to me, so I still dumped her. Now I find out she was indeed planning my birthday party. Fuck me!! She said she`s done with me and I can`t stand the thought that I`m loosing her because of my paranoid jealousy. She`s the best thing that`s ever happened to me but the thought of her cheating on me was unbearable. How the fuck do I fix this?