Please tell me thoughts .. im lost

I have been with my girlfriend for 4 months.

Today she’s woken up really moody and grumpy.. and nothing i say is right.

I sorted out vapes for her cousin and for us, and the cousins still hasn’t paid the guy ( who I have known since high school ) the money for them.

I msged her cousin but her cousin didn’t reply so my gf got shitty at me for msging her.. and I said well you do it then? And then she got shitty at me for saying that cause apparently her cousin is funny with that stuff.. I said to my gf that it makes me look bad seeming I know him and I’m the one who sorted it all out for the cousin.

She didn’t speak to me the whole way home I tried talking to her, and got silence and got “ nothing is wrong “

Then I laid on the bed and she took the dog for a walk. I thought maybe having some time for her self would be good.

She comes back and sits on the couch for about 20 minutes and comes into the room and says “ do you wanna talk now” and I said I have been trying to for the last few hours … well that was also the wrong thing to say cause she said I’m a smart ass and she walked off..

Then she comes back and says I’m going to Thomas house and I said “ ok”

Well that was also a wrong thing to say.. cause she stormed off and slammed the door and left ..

I honestly can’t win.

I’m so bloody confused and it’s giving me the worst anxiety ..

Have I honestly done something wrong here?