My girlfriend was my world.. i loved her and the relationship so much i stopped being myself in order to try and meet her needs which were complicated. Then one day out of the blue she left me for someone who I thought was a best friend. She moved straight out from my home and set up one with her. I miss her and the relationship so much. I don't know how to get rid of these feelings of rejection and disbelief at how she has treated me since we split up. I dont want to feel sorry for myself. I want to take control and make my life better. How do I get past the pain I have been left with?