the partition was still there, but if i tried to boot from it would just kick me back to the bios. unless there's some obscure grub bug that happened to trigger exactly after i booted into windows i guess...
the fix was pretty simple, i just reinstalled grub from a live environment.
I thought I was safe from this if I installed windows on a completely separate harddrive... I clearly overestimated Microsoft's ability to make on operating system that does not act like literal malware. Oh well! I guess I'm 100% linux now.
the partition was still there, but if i tried to boot from it would just kick me back to the bios. unless there's some obscure grub bug that happened to trigger exactly after i booted into windows i guess...
the fix was pretty simple, i just reinstalled grub from a live environment.