<human>: Condense the text into a few key points

I've been having sex with this girl I met since December. We did this arrangement for about 2-3 months before she wanted us to be exclusive. We started going on dates and acting like a couple but we werent together until we had the define the relationship talk. 

We tried being more serious for a month but it didn't work out because we couldn't see each other enough and she said that she felt like nothing changed since before when we weren't in a relationship. 

The problem is she's an au pair student and she'll go back to Brazil next year and I'm leaving for the navy this summer. And she said there's no reason to stay in a relationship that's gonna end at some point. I agree with this and she said it's better for us to go back before and be more causual and see each other when we can. It's weird because a week before she said this we were an official couple but then a week later she wants to go back being fwb. Im pretty sure she didn't find anyone else in a period of a week so I feel like she just wants to fuck and not be serious because she knows a relationship won't work out because of the circumstances.

If I wasn't leaving then maybe it could work but I kinda don't want a gf either, I still like her though and I still want to keep spending time that I do have here with her before I leave. She said she feels the same and still wants to see me. What should I do?
<bot>: my fwb of 4 months wanted to be my gf, we tried for a month but nothing changed and it  didn't workout, now she wants to go back to being causal before we dated. What should i do?