No, I agree with Redvelvet that often it's low self-esteem but also you do get some women (and men) who have such intense love for their partner they will always love them no matter what.
There was a case over here in the UK last Dec involving a girl called Sahar Daftary who died after falling from a building (her family think it was murder, hubby said it was accidental). Sahar had found out her new husband was already married and then dumped him. His 'real' (ie legal) wife said she still loved him and stood by him even after this and the fact he had cheated on her numerous times, had had run-ins with the police and a drinking problem. In her eyes she probably thinks she has such a strong bond and that much love for him she would never leave him. There was another case in Court this year where an English woman tried to hire a hitman to kill her husband and even after that he said he still loved her. Not everyone in these situations has self-esteem issues, sometimes it is just blind love.
I would never ever like a guy who cannt respect me or cheats on me or beats me up.Atleast im not n angel or more precisely a wacko.