how do i show my husband he is abusing me

my husband is verbally mentally and emotionally abusing me he has cheated on me just about all of the eight years we are together we've broken up several times hes let all the bills go, I've been the one who's left with the kids, he spends all the money, gets into a jam, foreclosure, etc. and cries for me back, promises the moon and then for a while its o.k., then the indifference, the hurt, the loneliness, he never comes near me, just finds ways to make everything my fault, even his loosing things, even makes me the bad one in front of our three year old, : go to sleep or mommy is going to get mad at us, etc.. never excepts any responsibility, even if he looses something, its my fault, if he goes the wrong way, its my fault, everything i do, he never has a nice word, even when we have sex, its ten minutes and all about him gradifying. and its only when i initiate it. there is no tenderness no kindness never a compliment for any of the thousand of things i do for him or the family one day he's nice and most of the time he's not he always complains and never listens always puts me down how can i show him that he is just cruel to me i tell him this isn't the way a marriage should be he doesn't believe me and says I'm crazy no marriage is full of romance why cant he wake up and realize what he has? I'm going to go crazy