Should I go to school tomorrow?

My ex wanted to talk with me During  lunch at school and I told my friends that I wanted to hang out and talk to my ex and what she said was that "it wasn't a good idea" and "don't come crying to me if he says something that hurts you." 
So I went with him and a few people were there (mostly guys and some girls) and We were all talking and one of the guys asked my ex wondering why we dated in the first place. And this is what he said 
"Well I felt pity." 
And that small comment riled up most of the the girls and they were defending me and here's what I said: 
"F*ck you Nick, you're the one who invited me up here in the first place and I literally threw away my friends for a piece of sh@t like you."
After that rendezvous I went down to the bathroom crying my eyes out until the 6th period bell rang, and I felt like sh@t after that. 
So now I'm home sitting in the darkness Drinking Dr.pepper (Alcohol replacement) Contemplating whether I should go to school tomorrow, because if I do I'll have to face him but I'll have balls enough to face him 
But if I don't go, I'm stuck drinking Dr.Pepper, and everyone would probably think I'm a big wuss for crying over a piece of shit like my ex. 
What do I do?

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