Feeling empty after a date
tl;dr :
My (M23) girlfriend (F25),with whom I was in a relationship for two years (the second one long-distance), says she feels an emptiness, even though the relationship is going well, and she's convinced she needs to break up. She's never told me about this specific issue, or any other problems, and now it's too late. We are trying to meet in person and I would like to make her understand that now that I know about the problem we can work on it together.
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My (M23) girlfriend (F25) says she feels great with me, notices that I treat her well, and is attracted to me. But at the end of the day, she feels empty.
To add, we've been together for two years, and the last one was long-distance. We saw each other every couple of weeks, but lately I haven't been able to visit her, so she traveled to see me. We have plans to move in toghether in a couple years, when I finish my studies.
I think recently, after some of my shortcomings, that she hasn't told me about, she believes that her sensations is a problem and is considering ending the relationship without giving me the chance to discuss it, she convinced herself that this is the only thing possible.
I've read about people having this feeling after a first date, as if they're afraid of building something good and already knowing it will end. I think she's not thinking too much about this feeling and can't make sense of it, entering into a state of self-sabotage and thinking she's settled with being with me, but I find it strange, since, as I repeat, everything else is perfect.
I think her biggest mistake was not telling me about it, and mine wasn't realizing it in time. But I wanted to ask: is it normal to feel empty, even when you're with someone with whom you have a truly great connection? How much of an impact do you think these shortcomings might have had?
Due to work reasons, we won't be able to see each other for three months, and she wants to break up before leaving. I was hoping to understand something more about what might be causing this feeling, since she can't explain it well either, and I only have one chance to talk to her and see if we can fix it.
Do you have any experience on something similar that you can share? Could a no-contact period help her understand if she truly doesn't feel anything or if the emptiness increases without my presence? Would it be better to mantain the relationship and try to overcome this issue between us?