Please Support me and tell me. My love ditches me for someone else.?

I was having relation with a very good gal for 3 years and 3 months. I met her last day, next day she told she has to move, she is having another person. I am completely out of control. I tried to make her understand but the things are getting worst. Now she insulting me in front of her colleagues. I love her more than my life. I dont want to live. but i have to live for my parents. Plaese help me out. I am trying very hard since two months but I am not able to forget her, I am not able to sleep, to eat. My life is on stake. I am not able to forget the tome we spent together.