<human>: Give me a shortened version of the text

So my girlfriend on and off for 3 years is spending the summer studying abroad while I'm working. Before she left I broke up with her because she chose studying abroad and then moving back with her parents after (halfway across the world) over staying with me. She begged and pleaded to give long distance a chance; and I was convinced it could work so we got back together. This was 3 weeks ago. Last night, she breaks up with me with a few brief texts. On a Saturday night. In shock, I reply back flippantly and that was that. It's been a day and as I've been stewing it's making me more and more upset. Just the DAY before, she was telling me how she loved me and what not.

I can only assume she either cheated or is suddenly caught up in the fervor of partying abroad and wants to sleep around. Either way, it was a cold cold way to end a 3 year relationship. I had no idea she was that kind of person; I really never saw it coming. Should I bother finding out what went wrong, what the situation is?
<bot>: GF of 3 years studying/traveling abroad abruptly breaks up with me after convincing me we could make long distance work. Should I try to get some closure out of the situation?