This Hurts...

My best friend of 9 years and I dated. He wasn't a virgin. And I knew that, he had sex with almost every girl he's dated. But I over looked it, because I honestly loved him. 
We were together for almost a year, and yes, he took my virginity.
Then some stuff happened and we were supposed to be on a "break."
I cried for literally, 3 hours. Because I knew this was going to be the end.
The next few weeks went by and I went with him to the fair.
His ex girlfriend was there and he was hanging out with her, a lot. And, he was holding hands with other girls and letting them sit on his lap, people sent me pictures, because as far as everyone else knew, we were still together.
So again, I cried, and cried, and cried, and then cried some more.
now, him and his ex are back together. And it hurts so bad.
We ignore eachother. Haven't talked in 103 days.
I'll be going to there school next year, and I don't know how I'm going to face them. Because I know I'll see them in the halls.
He honestly, ruined me. But I miss him so much. 
What should I do?

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