Police let my ex go for reckless driving. Subsequently i was seriously permanently injured by him for same. I need help.

He was on probation, no license, insurance, or registration, had been cited for reckless driving 2 weeks prior, had a bench warrant for fta, alcohol present in sys. (Test results documented, but lost). Probation officer has "managed his cases for years" . Travelling at 100 mph in a 35. No injuries for him. He blew .048. Me : life threatening, permanent ( 3rd deg. Burns 40%, amputate 1 leg, 6 mos. hosp) how do i see that he is tried for this? Can i sue the police for neglecting to arrest him resulting in my injuries? have my civil rights been violated? Dont know whom to contact.