I cheated on my barber.
What would make you cheat on your barber?
I didn't want to go there anymore.
It's obviously your right to choose who you have cut your hair, but you should consider your previous barber's feelings. They would probably be upset if they found out you are no longer going to be their customer. You should consider talking to them about why you want to go somewhere else.
Who fucking cares? They probably find another customer anyway.
But if you've been with him a  long time and there is a relationship, he probably does care. It's okay to just send him a note about why you are moving on.