How can get over how my friends betrayed me?

I am in the 7th grade. My friend,Tracy ,who i had been friends for 2 years, betrayed me with my other friend ,Paula, who was new to school this year. Then, Tracy and Paula, and 4 of their other friends made a hatelist about me on gaia.com. I was really sad. Now, I have just one or two good friends who i can trust, while both of them are in a group of 7 people. They even made the hate list in school and made most of the people in 7th grade hate me too, altho i didnt do ne thing to them. They made them sign it. Everytime I see them I have these flashbacks of how all of us used to be friends. What should i do to get over this, because its been 5 months