I plan to cut my best friend out of my life. We've been friends for 10 years, but she hurt me.
Why would you cut a good friend out of your life over a small disagreement?
There's a difference between a small disagreement and a betrayal.
I know it can hurt to have a friend do something that upsets you, but you should really think it over before abandoning a friendship with someone you've known for so long. Instead, why not talk to your friend and explain to them how you're feeling about what they did? They would probably be willing to listen since you are such good friends.
I'm not feeling like dealing with her.
While I don't think it's a good idea for you to abandon a long-standing friendship, I guess I can understand not wanting to be friends with someone who betrayed you. If you don't feel like you can forgive your friend's betrayal, then it's understandable to want to move on and leave the friendship in the past.