Argument with partner [M21]I’m [f20] am I responding correctly ? Is this behaviour ok?

On Christmas of 24 my partner [m21]overheard me and his mum talking about a subject he didnt like and it led to him completely losing it and crashing out and I mean completely losing it , I was hysterically crying his mum was upset , I had to spend an hour in another room for him to calm down , was trying to sleep on the floor and ended up trying to call my cousin [19 F]who I had recently fallen out with because she bad mouthed my partner [m21]anyway she answered and I said please please come and pick me up I need to go home I then explained what had happened and she said she couldn’t pick me up as she had been drinking. She then messaged me saying “everyone is here for you when you’re ready” I didn’t know what this meant but it was nice to hear her being supportive even if we were on great terms. Fast forward to today 12/3/25 and my partner [M21]has messaged me absolutely rudely and abruptly saying that people have been telling him I have told my cousin [F19]that he is abusive! I wouldn’t ever say anything like that if I wasn’t being abused because I know how terrible that is and he isn’t abusive towards me he’s never hit me or anything like that , he said why did my cousin [F19]text me saying “we’re all here for you when you’re ready” and sent me texts such as “ in what world am I abusive your fucking spoon fed and babied by me all the time .. once I find out there will be consequences for everyone involved I promise you that” and “ why would you tell people what’s going on in my house … don’t like it leave feel unsafe … leave It’s really simple”

I then told him he’s being extremely irrational and immature he could’ve just messaged me politely and asked if he’d heard anything that raised him concern … he does this everytime he has something to mention it ends up in a hurtful situation and his words are hateful and really rude He is saying that he’s gonna put 0 effort in to the relationship now and maybe “ we shouldn’t be together” because I said that the way he reacts to things isn’t correct and he overreacts and shouts or he ends up saying we should not be together and threatening that everytime a problem is raised