What do I do? How could this happen?
For context, I am 21 and my girlfriend is 22. We are both Australian and are both in university at the moment studying Law. We have been together for over 3 and a half years.
Throughout our relationship, my girlfriend and I have been extremely happy. There have been ups and downs, but we have always worked through it. We have always learnt something new from our conflicts and improved out conflict resolution. We have spent a lot of time travelling together during university breaks. We could talk about anything, and we often did. We were really intimate, shared similar hobbies and interests; everything about our relationship was really amazing. Even after three years we were always excited to see each other whenever we did. Ultimately we loved each other a lot.
We returned from our trip overseas about 4 weeks ago. We had gone to Asia and visited countries like Korea and Japan and had an absolute blast. The whole time we really enjoyed each other and the trip; I thought it was a great sign. We had 1 week of holidays remaining wherein we were still really happy. 1 week after returning from overseas, university started again. At this point she started feeling insecure and wanted assurance from me. My girlfriend often feels insecure and usually I hug her, we talk about it and I reassure her. I did the same this time, I figured that she was probably starting to feel stressed because university was setting back in and the carefree life we had been leading overseas was coming to an end; hence some feelings of insecurity.
However on the Monday of the second week of uni (2 weeks ago) she suddenly shut down and closed off all communication. We would be together, and she would look dead and unhappy. I didn't know what was going on, I kept asking her, "are you okay?" "You can talk to me at any time". Sometimes she would say she was okay, and smile and things would be okay and we would be like normal. It all became complicated after that. I became sick on the Thursday with a high fever. I called out to her for support but she was still kind of shutting me off. She said texted me "i hope you get better soon", however it felt like she wasn't really concerned/she was just pretending to be concerned.
On Sunday, 16 March, we met up for dinner to celebrate my 21st birthday (which was on Monday 17th). She took me out for a really nice dinner and gave me great gifts. We were talking again at dinner, and things felt sort of normal. We kept talking and at one point I asked "when do you want to move in together?". I don't know why I asked the question, maybe I was testing the waters to see if things were really like normal. In the past we had talked about moving in together and taking the next step, and we had positive thoughts about it; we had both agreed that we wanted to do it. When I asked that question her face fell, and she said "can we talk about this some other time?". Of course at this point, alarm bells are ringing for me. The past few days she had been shutting me off and avoiding me so I already saw red flags, and then she said that. At that point I felt a sinking feeling, I knew something was really wrong and I really wanted to talk to her about it. After dinner as we were walking around the city, I asked her "Should I be worried about our relationship?". She avoided it again. Eventually we started talking about it - she had been holding certain thoughts and feelings about the relationship the past week to ensure not to upset me on my birthday.
She said many things. She said that she was worried about the future, and worried about how things could go wrong with our relationship. She was worried that things could go wrong regarding our future careers, and that if we worked in the same industry (Law) we might fight and compete against each other, causing lots of conflict. She said she thought she might be too dependent on the relationship. She said that she felt the relationship might be stifling our growth. She said that she felt inherently unsure about committing to her first boyfriend, because typically the first serious relationship doesn't work out (this is both our first serious relationship). She said that she was worried about just being happy with the relationship and sticking with it, and then ending up unhappy later in life.