How she behaves towards other people is one day how she’ll behave towards you.
Is she mean to other people?
One day she’s going to be mean to you, probably in the same way she’s mean to others.
Does she like to steal? Does she rationalize stealing?
I’ve run into girls who like taking alcohol from parties, or silverware from restaurants, that kind of thing… they seem proud of it. I haven’t seen the deeper levels of this behavior because the stealing is enough for me to distance myself from them.
Does she somehow always have drama with her friends, bosses, family?
One day she’s going to have drama with you, and by the way the police and courts are going to believe her, not you. Logically you can argue that this is not fair, but it’s true, and you need to protect yourself, not argue about notions of fairness.
Does she spend money poorly or earn money poorly?
One day she’s going to come to you for the money.
Does she tell you stories about kicking out some guy right after sex, for no good reason? Does she tell you stories about being mean to guys who are flirting with her? Those are things that are good to know, because you’re going to be her mean story one day and you should prepare appropriately. If she is proud of being mean to other people, one day she’s going to be proud of being mean to you.
Everyone has moments of untoward behavior, including me. If you somehow made a montage of my worst moments I would look bad. Things are grey, not black and white. But when you are building a model of a woman, or of anyone, take into account the red flags. I have been a low-down dirty dog. I’ve also been very effective and enabled experiences that would otherwise not have happened.
Other people are going to judge you the same way. I have lost people because of my interpersonal proclivities. That’s fine, it’s a cost of being alive and living a full life in my view. I do the things I do and pay the price for them, like we all do. But you should decide who you are and what kinds of things you’ll accept in people and what kinds of things you won’t. If you don’t, you’ll get what you get, and then you’ll bear the costs.