Will I most likely never tak to this guy again?

You were thinking 'relationship' from the teasing/ flirting and he most likely, was being a guy and having fun teasing and flirting with the cute girl.. it most likely never occured to him the whole relationship thing so you probably shocked him. Girls and guys think very differently. Now he clearly is able to tell that you are upset with him.. you de-friended him your friend called him a jerk, etc. All you can do now is give it time... don't talk to him for a while.. act unphased by all this and don't make an effort to apologize or talk to him.. and who knows, maybe things will turn around eventually but for now I think you need to just keep your distance.