Can stress lead to breakup?

So in the beginning of this summer, I started to date a girl who was one of my closest friends for the past 5 years. In the summer, we had an amazing time doing the things that you can only see in the movies. The chemistry was ideal. In the autumn, we both had to get back to our universities to study, and problems started to arise. Since she is studying medicine, I knew how hard it was, so I tried to do my best to support her. In the middle of October, she started to become more distant, and we spent less time together since she had a few exams coming up. It seemed normal to me since I know how important her studies are to her. Another week passed, but the situation became even worse. I started to get a bit nervous, and I asked what was going on. She told me that she doesn't know what is happening with her, and right now she does not want to think about relationships but wants to focus on her studies and career. I asked if she want to break up with me and she said yes. I know that she will have several very hard exams in the upcoming weeks, so the question is: is it possible that her decision to break up with me is related to the pressure and stress that she is facing right now, because of the upcoming exams? Should I text her after the exams?

Can stress lead to breakup?
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