Well she likely ends up being the victim because Janet picked up what she saw her parents do. With Janet's mother, Katherine she has stayed with Joe despite his constant cheating on her and the fact that her kids were abused (verbally and physically by him) . With Janet's father, Joe it is known he was abusive towards the Jackson kids (verbally and physically) as well as it being known he would constantly cheat on Katherine which in one case has resulted in him having a child with a mistress (Joe has a daughter/Janet has a half-sister that is a few years younger than her named Joh'Vonnie). Janet stays in these relationship long-term like Katherine has but with her 4 serious relationship she ended up either dating or marrying someone that has had tendencies of her father Joe.