Because I told her I'm never getting the vaccine, and that masks and vax passports are retarded and pointless.
I knew we always had political differences but it was never a major issue until some degenerate doctor told her family that covid was the reason her 90 year old grandfather with the worst case of Alzheimer's/dementia you could imagine passed away.
It actually hurts my soul, not that we broke up, but that I realized I spent 5 years of my life with a partner who was as lizard-brained as the rest of the 99% of the world's population.
Do not feel too badly, it wasn't a total waste; some of them can be converted, some will come back later to say you were right, but not until after the right mirror cracks in their minds. Hopefully you planted some seeds in her brain that will sprout eventually.