I'm going to tell people why I cut off my friend that likes me
You cut them off? Why?
Yes, the person did something I didn't like.
Maybe you should talk to them about what they did. Publicly talking about it could cause them embarrassment.
I know. I'm such a bitch for not liking them back.
It's okay that you don't have feelings for someone that has feeling for you. It's not something you should gossip about. They probably feel badly enough already.