I'm going to break up with a friend
Is this a mutual ending or a unilateral ending?
It is unilateral, I'm the only one that wants to end this friendship
If you don't want to talk to someone anymore you don't have to. We all have our reason for ending a relationship.
I'm just going to break the friendship off then.
It's probably a good idea to do so, it sounds like you don't like this person much anymore.