Yes. You are wrong. You should never spit at anyone. No exceptions.
And…. you should never try to be exclusive before you’ve dated someone for at least six months. It’s controlling and it’s not realistic. People play the field because it’s healthy to do so. Making an exclusive commitment too soon puts way too much pressure on the relationship and creates drama and mistakes.
I’m sorry that you are so angry and hurt, but you have to figure out a way to control your temper. Spitting on or at someone is never okay.