Conspiracy Theories, Holocaust denier and “Hitler was right” craziness

I have been dating my now ex for 5 years. It used to be that he is a Republican and I am a democrat. Some switch flipped over the past year and suddenly everything was a conspiracy. Every sports game fixed and just a show to take peoples minds off what’s “really going on”. Whatever that is. Any conspiracy theory that he came across he believes. He doesn’t believe the moon landing was real. Whether or not it was I don’t know what it is so upsetting to him. Last Friday he told me that Hilter was right. On Monday sent me a text that the holocaust didn’t happen and gave me all the reasons that Hilter was right. Wtf, right? It’s like he has been brainwashed by podcasts and IG reels. So I broke it off very short. Just said I can’t be around someone with your beliefs. I feel like I’m going crazy. Anyone else experience anything like this?