<human>: So my girlfriend lost her job recently and asked me if she could stay at my place for the month of June. I told her I was hesitant--I've never lived with a girlfriend before and I was worried things could get complicated if the job search didn't go well--and she said we could decide after our vacation together (a long one: three weeks).

Well the vacation's done and my concerns haven't really changed. We get along fine for dating, but I don't think living together is the best idea, especially after seeing how we handled disagreements on the trip.

When she brought it up again today, I expressed my doubts and she became very upset and withdrawn, partly because of the hassle of extending her current tenancy a month, but also--I suspect--because of what my doubts mean for our relationship.

It's true, I also have doubts about the relationship because she wants to leave this city. Soon. She even has a big interview in another state. We both talked and we know it may be just a short fling in the end, so I'm even less inclined put myself out in this situation.

Now I realize it's only for a month and she's agreed it would last no longer than that, but should I still be concerned? Is there a chance this could backfire? Should I agree, but lay out specific ground rules to avoid problems? Any advice is appreciated.

Summarize the given text in a few sentences.
<bot>: Girlfriend wants to stay with me for a month, but I'm against it. Should I stick to my guns or suck it up and let her stay?