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

So my girlfriend and I met 4 years ago at college through a mutual friend. Our first year we were long distance in the same state, visiting each other on breaks and almost every other weekend. Then she came back to school and we practically lived together in on-campus apartments. Last year we moved in together off campus and it was an amazing year and a half. This school year I had to move back home due to family financial issues, we made it work just like before visiting on breaks and most weekends.

She, only recently (past 3 months), became interested in the peace corps and just finished her application and medical. Here is the kicker, we had talked about what we would do when it came time for her to leave and then out of the blue she just decides to end our relationship because she couldn't see us staying together while she was away. 

What really bothers me is that after spending so much time together in a happy and healthy relationship that she wouldn't want to stay together until she was 'deployed'. This happened the Monday after valentines day, I had bought her an expensive gift and nothing seemed out of the ordinary. She had me leave immediately after she let me know her decision. It hurt ALOT..

I didn't see it coming, and thought we could have talked it out more to come to an agreement, but it has just been a painful and confusing experience for me. She hasn't talked to me much since and I'm confused as to her motives for ending an amazing relationship just at the prospect of joining the peace corps. She says she still loves me and I will always love her, I'm just confused what would make her do this.

Her family had even gone through the trouble of buying me a plane ticket for their vacation to mexico this month.
<bot>: Gf of 4 happy years broke up with me before applying for the peace corps (6-9 month wait before leaving for assigned country)and a month before a planned vacation to mexico.