<human>: Summarize the given text in a few sentences.

So after about a year long relationship through my senior year of high school, my girlfriend broke up with me kinda suddenly. We were fighting a little bit more towards the end of the year than we normally did but they were usually really silly/not serious issues she never seemed to hold any kind of anger about any of them. However, last week, she told me that she "need to talk to me" and then told me at her house that we could no longer be in a relationship. When I asked her why, she simply told me that she had "move on" and didn't want to be with me anymore. I tried to press her for details and apologize in case she was upset about the little fights we were having but she just told me I did nothing wrong and to leave and so I did. I'm still a little heartbroken but is it okay for me to seek from her some sort of "reason" as to why, or should I just let it go? I'd like to get back together with her but this was very sudden and I've been handling it very poorly so I'm just looking for advice on whether to pursue her or let it go?
<bot>: Girlfriend broke up with me out of the blue and didn't explain why. Should I seek a reason or let it go?