My girlfriend and I have been together for a bit more than 2 years now. At this point, our relationship is stable and we feel good about each other's company. However, there's one thing that really upsets me: she hardly ever apologizes.
For example, last week we stayed in a hotel. She washed her clothes but had nowhere to hang them. So, she hung them on the back a chair that I was sitting on. She asked me to be careful not to drop the clothes. I said yes because I was not in contact with the clothes: it was a big chair and my back wasn't even touching the back of the chair.
After a while, I found the clothes on the floor. I immediately picked it up and told her. She became so mad at me and said that I'm responsible for it.
I tried to explain to her that we were both responsible: she put the clothes in a weird place and I made it drop somehow. But she insisted that it was ALL MY FAULT. Period. She was not willing to discuss about this conclusion anymore.
Such situations happen quite frequently in our lives (at least once per two weeks), and sometimes I can get an apology, but like weeks and months later, after she "calmed down".
How can I encourage her to apologize when these situations occur?