Why

why would some one get in to a relationship that is highly abusive where the man actually admits to wanting the woman's children for before so he can do the same to them as he does to her and she actually defends him & believes the fantasy he paints of every one lies & hates him sympathy trip and still she stays. accepting everything as just fine ........my friend had 2 girls both now living with grandparents both adopted by the grandparents because of this guy but my friend is so drunk & or high she doesn't seem to want to do anything she has places she can go & be safe but as she keeps saying it would be away from him. so my question again is why and don't feed me this BS about love or loyalty first instinct of any parent is to protect but what do you do when not even your friends will do that for their own?