I did vote against Trump, but I also voted against Harris. I did that because, unlike you, I didn't want genocide or fascism.
No, you did not. You engaged in a purely performative action with no statistical chance of a positive outcome against fascism or genocide, so that you could brag about your moral purity while offering up the rest of us to fascists, including your SO, apparently, to feed your ego.
You can lie to others and you can lie to yourself but, the math doesn't lie. FPTP system with established parties (one of them openly fascist, that already attempted a coup) meant that there were, mathematically, two options (not a false dichotomy but a real one): voting for a candidate with a statistical chance of winning against the fascists, or letting fascists win. You chose the latter and, if we survive this, that's something that you'll have to come to terms with and take responsibility for.