Help with moving on

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Ok first here is some back story. We had been dating for about 5 months, I cared about her a lot. She was the first girl in a long time that I actually let my guard down with. I bought floor tickets to a concert that she was really looking forward to going to. Those tickets cost me over $300 to get. One of her friends was going with us and she had an extra ticket, we tried to find someone to go and eventually one of her male coworkers came. I found out in the parking lot before the show that a time before when she had mysteriously disappeared while we were at the casino and didnt respond to my texts and calls, that she had gone with this guy. Then as we were going in they were flirting with each other, and he was slapping her butt and she was hugging him. Then as soon as the concert started she kissed him right in front of me, with her knowing that I saw this. I freaked out and pushed them, then walked away. I came back and confronted her, but the guy pushed me and i pushed him back and security dragged me out. They got to see the rest of the concert. I called her many nasty things via text messages, I even did some damage to her car. My question is how do I get over someone that when I see that i get so angry that i am blinded by rage. I wasnt a jealous man until i met a girl that was worth getting jealous over. I truly loved her, and she treated me like dirt. I need some help on what to do here. I am trying to just maintain a busy schedule, but its tough to sleep. What should I do?