Can't get over this pain? How to?

My ex (I dumped him because he cheated) cheated on me with a girl I don't know that much, but I do kind of know her a little bit. It turned out he had been hanging out and talking to her the whole time we were dating, kissed her and everything. Its been months and it still hurts because I really liked him a lot. I thought he was perfect. I don't want to go to a therapist because it would be too painful for me to talk about. It's easier for me to explain it on here. I still have violent thoughts I want to do to the girl who helped him cheat, she even knew he was my boyfriend. What should I do to move on? It still makes me so angry.
Can't get over this pain? How to?
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