I hate my best friend.
How could you hate your best friend?
I do not want to be friends anymore. He cheated on me after we had been best friends since kindergarden.
I can understand your feelings towards your friend. It is okay to dislike people, but hate is so strong. I think you should discuss your feelings with your friend and maybe you can make up.
Fuck no.
If your friend cheated on you by finding another friend, just realize that your friend is allowed to do that. If your friend did something to make you angry aside from that than i am sorry cause that sucks. Either way, your best bet would be to address the issue with your friend directly.