What in the world is happening?

My girlfriend encouraged me to buy a house a year earlier than I had planned. I wanted to wait because I felt it would be better to reduce my credit card debt and increase my savings first. Additionally, I was curious about the raise I might receive this year. When I expressed this, she got upset, saying she was tired of living in our apartment. As a result, I ended up covering all the costs for the new house. Later that evening, I took three of our cats to the vet for their vaccinations. She didn’t want to stop by the apartment before heading to the new house to start assembling the furniture I had paid for because her car was broken, which was a separate issue altogether. I had taken a look at her car, gave her my opinion about the problem, but she chose to trust someone at work who claimed to know more. When we arrived at the house and started putting together the furniture, one of our cats stayed close to me, while the other two were hiding. Eventually, we found them jammed into a small space next to the fridge. I put them in a separate room to give them a safe place to hide, but she let them out again, and they returned to their hiding spot. After four hours, I was thirsty, and I noticed the cats were stressed, so I suggested we return home for drinks and to let the cats settle down. She told me she was too tired to make the trip, but I insisted I would take the cats back since they were uncomfortable. She managed to convince me to help her assemble a couple more chairs, but we discovered the legs were mismatched. Even after that, I reiterated my plan to leave, and she suggested just picking her up later. Eventually, she understood and came with me, but then she blamed me for leaving an upstairs light on, which I ignored while turning off the porch light that I hadn’t touched all night. We drove home in silence. Now, she’s gone to bed early and isn’t talking to me. What did I do wrong?