Step Daughter ruining my marriage

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You come in a point of life when smaller girl (16) make you doubt yourself your values in life your thoughts and belief in which you have raised yourself and your kids to be well behaved sucessfull teenagers. Now i have to doubt it for a girl that has been problematic from an early age, beating up her own mother and calling me names that no respectable women would like to her about herself, and manipulating so many unimagiable things that me as an adult would never think off. The love of the father makes him blind. Finally he gives up since makes him feel guilty for her bad behaviour. I have tried to be a freind, I have tried talking, i have so manythings but its like a knife behind your back. I feel my self going cold towards a beautiful relationshio i shared with my husband. Sometimes I feel my husbands to blame since he cannot do anything about it. Im sure that things will not change(genes her mother was and is very conflictive) i don´t see that in the last 5 years or just ignore ( in this process Im hurt and my kid too). Its like living in his past always hanging around, depends on what happens in his Ex and his kids life to have a happy envoirment in our lives. Now its 3 months since we been together, all due to manipulations and lies and problems of his daughter that effects our married life.Im young (34 and I do make heads turn) Im not finding enough strength to leave. I dread this decision. This is my second marriage and I thought I made a very carefull choice of man to be my husband the head of my family and good example to my kids. Im so afraid to accept that maybe I made the wrong choice. Im in a new country with no family around Only his freinds are mine. Have started a Job 6 months ago......Somebody please help me!!!!!!