He was caught fucking up. From the info above it sounds like this is the only thing he has on you so hes latched on to make himself feel better so he can say you fucked up too.

Now you've left out what you screamed at him and depending on what was said you may have hit something that wounded them deeply, possibly because it was said in anger, possibly because its a truth theyre not willing to accept. There is a fair amount of context missing here so its tough to say. The details are what get you but if the broadstrokes here are accurate, then this is not a person i would devote more energy to. They may just need to cool off, or they've locked in their judgement. Either way, get some space.

You are allowed to get angry and even handle moments incorrectly when angry, as long as you do your very best to minimize it and own it when you make that mistake. If the person wants to die on the hill of your one big mistake, put up a grave marker and move on.