How do you get back at him?

Why waste anymore of your time on someone that doesn't care about you? He doesn't care that your upset and that you want to get him back because like you said he just used you. I know it's harsh but just move on and learn from this. Honestly he probably just is a big , but you going that far with him is probably why this happened. When you go that fast with a guy they dont respect u. He saw the opportunity and took it. Next time wait a bit longer the the first date before u jump into . You only attract the jerks when you act like that. Next time take it slower, if the guy is really interested in you and getting to know you, he will call you again. This probably won't be the first time a guy will hurt you...trust me you will be the only one hurting.... just move on and dont time you spend on trying to get back at them.