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What if the roles are reversed? Is the women sexist? 
Also just trying to grasp this.
Is being murdered by an ex-partner considered sexist? If so, what exactly makes it sexism? 
(Genuine question, I’m not saying this is okay, just asking which part makes it sexism) >

Yes, iirc under newer spanish law, violence against women by former or current romantic partners is considered a sexist crime (if attacker is a man, that is) >

Yeah I’m just trying to learn why that is considered a sexist crime. I would just consider a violent revenge / psychopathic crime. What in particular makes it into a sexist crime? Just if it’s a man attacking a woman? >

Gender-based violence occurs usually when the man believes the woman has done something that a woman, precisely, is not supposed to do, based on his beliefs about how women, precisely, should behave. Hence sexist.