abusive relationship !

I have been with my boyfriend for 8 months he has made my life a living hell for 6 months straight he has called me every mean name there is he has physically and mentally assaulted me on many different occasions he says it's always the last time but it never is I try to leave him and he threatens me I don't want this negativity in my life anymore but I know what he is capable of when you get on his bad side I need help !! He's a dangerous man