I have recently nuked relationships over different values. It hurt but I know in my heart it was the right thing to do. I dont want to be the type of person that has a person like that in my life and covers for them.
Consider if this person is worth sacrificing your personal values and morals for.
Is it really common though? Looking at the generalized US stats its seems that 95%+ of women murdered are by a person they know. Where as for men that stat is 78%. Its pretty rare to get murdered let alone murdered outside on the street. Most* people fear strangers because of news events not because of likelihood.
Random murders just aren't common and random women murders are even less common. Even rape and sexual assault the stats of random attacks on the street are very low. https://cde.ucr.cjis.gov/LATEST/webapp/#/pages/explorer/crime/crime-trend
This is for the US, I'd expect it to be far lower for most other countries.