This guy used me? how do i act?

Okay well Im not gonna explain the entire story.. soo. long story short, we had a "hangout/date" and he got what he wanted and now hes ignoring me and dealing with another girl. I want to spaz at the kid so bad.. but Im not. Its too confusing, but yeah anyway, I want him to regret doing it, like i want to prove him wrong. How do I act when I p him? What do I do? I want to get another guy just to piss him off lmao :P, Help please!!! :)