Oh child, thou hath awakened me from my slumber.
Im gonna put this real bluntly. You don’t understand Cavendish.
Cavendish is a man with a MASSIVE hero complex it's one of his defining traits as a character. He also has a very complex relationship with failure.
What happens when the hero of a man with a hero complex who is a fundamental faiure but refuses to acknowledge it, fails?
He projects. Hard. That's all I'm going to say about that one.
Second point, Cav asked Dakota so, so many times to help him, begged him to believe him, and was basically gaslit and dismissed for it. This episode in particular places a VERY strong emphasis oh Cav's hero complex: he saw someone in danger and felt an overpowering need to help them. That you don't even remember the VERY IMPORTANT REASON (literally saving Milos life!) that Cavendish "ran away for" is wild. Cavendish did not just up and "abandon" Dakota, he saw someone in danger and everyone else, Dakota included, refused to believe him, nevermind help him.
Next time, rewatch the show and actually get the facts before you demonize a character. You can dislike him all you want, but its bad faith to throw a character under the bus when you dont even have or provide the full perspective on their actions.
Also, a warning. This is a VERY small VERY rabid fandom and you will quickly learn that there is absolutely no place for this kind of toxic take within it. Disliking characters is fine, your attitude about it is not. It's people like you that sour otherwise good fandoms.