How do I come out of the feeling of betrayal?

She said that she wanted someone with whom she can share everything, I ured her that i was there for her as a friend. She then wanted me to be her everything, I believed her to be a good girl and i was committed to her. For few months everything seemed to going on so well, though i heard many people say that she's not right etc etc i did not bother, i continued with her. Now slowly after a year or so I understood that actually I was being lied to, i asked her she maintained her innocence, i still believed her. Until atlast I saw with my very own eyes, yet she kept uring me that there was nothing like that. Atlast one fine day she said that she doesnt like me blah blah and that she wants to move on, its not that im a bad guy but she thinks im not the right guy for her and she left me. I stood by her in situations when she cried at me saying that she was d when she was a child. I lost some beautiful friends in my blind love, its been over an year since i broke up with her. I ve been trying so hard to forget her, and i was happy till recently when i saw her again even after moving to a new place. This time she was with my long time rival, I dont know what is that im undergoing through? Is it jealous feeling or is it a feeling of betrayal, why am I feeling bad if she is moving on with someone and why am i bothering about someone who ditched me? Please help me i ***** sleep for the last two days. I have this mixed feelings, and im hating it and feeling like to break everything. its so hard to control emotions...! **** that *****