Another poster here appalled by IanOsenfrote.
Also, considering how much pleasure they have in mocking the errors of others (never had any predictive text error "corrections" mess up a message?!) then it might have been expected that their original post would have been grammatically correct.
Anyway, op... you didn't have to test and could have just stayed away from people to avoid possibly passing whatever virus on, as some did before Covid was around. But LFTs were brought in because Covid was considered more highly transmissible and therefore also of greater risk to the extremely vulnerable, and Covid is still around. So whilst you didn't legally need to test, I think you did absolutely the right thing.
Your partner knew you were ill and would have gone in and risked spreading whatever virus it was. The only thing that's changed is he knows the name of the virus. Up to him if he decides he knows best and goes in anyway (and legally he can.) He doesn't have to tell anyone. It's not even necessarily a particularly bad thing to do, depending on his colleagues and their family situations re vulnerability. So why is it worse for him now he knows it's Covid? Because he has to knowingly decide to be selfish as opposed to doing the exact same thing in ignorance? That's his issue, not yours.
He's being a controlling prick and you're being the verbal punchbag for everything else in his life, I'm afraid.
Might be for the best he's going to be working away.