I just going to end this relationship.
Why do you want to end it so abruptly?
I used to feel like when we became friends it would be a friendship worth keeping and building on, but now...
You can be curious what would happen. But don't throw away a friendship on impulse.
I want to end it fast before I have any regrets.
It seems like you're overreacting to a feeling when you should be trying to understand it instead. You should try to figure out why you feel this way about your friend rather than just ending the friendship for no reason. Think of it as an opportunity to grow even closer.