Ex boyfriend help? Only need people who know about the jail system?

yes absolutely. physical assault with death threats will land him in prison. In case you're thinking of trying to get him out, in modern days, it's the government's responsibility to put him in jail, so even if you ask for him not to be, or try to not press charges, it won't work. It's best to just be honest. That is absolutely scary that he did that to you, and if he can kick, throw and smother you, he can snap and kill you. Be safe and honest, but yes, he is facing jail time.