I still don't understand why some women are attracted to assholes, please girls help me understand, desperately try to help my friend out?

I still dont understand why some women are attracted to assholes, please girls help me understand, desperately try to help my friend out?
PLEASE UNDERSTAND I'M NOT HAVING A GO OR BEING judgmental, THIS IS GENUINE HELP I'M ASKING FOR.

I know this isn't all women, but so many seem to be attracted to guys that are just shit men and treat you like trash, yet some seem to cherish it.

What is the reason for this, it is because they have great dick, or you have self esteem issues, or something else.

I'm really trying to help a friend out who is in a terrible relationship with a horrible guy. She is constantly sad and unhappy, but just won't admit he's an asshole. She comes to me crying asking what to do about him, but never does anything.

And she says things like "oh but you don't know him like I do", and "he doesn't really nean it." I don't think he isn't violent, as far as I can tell it's more a psychological thing, putting her down and belittling her constantly, and making her feel worthless.

What the hell? Why is she doing this to herself, why is she is denial? I'm normally very good at the psychology side of things but this one has me stumped.

Please ladies give me some insight so I can help her? I've offered her a safe place to stay if she wants to leave him with no strings just to be here for her as a friend.
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Please accept my apologies for the invites ladies, I usually hate doing it but I could really do with some insight here. Thanks for your time.
I still don't understand why some women are attracted to assholes, please girls help me understand, desperately try to help my friend out?
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