When is it too late to confess your feelings?

I've been living in another country for the past few months. Recently I met this amazing girl but so far I've just come as close as being friend. However I know that if I would take the step there is potential for something more. The problem is I'm leaving the country soon and so is she (she's not from said country). Is there a reason to confess my feelings or should I just accept that in reality we can never be a couple. Will she be better off knowing that I did indeed have feelings or will it just make her sad. Is there any point in ruining a perfectly good friendship for something that might only last a week or so? Sorry for all these questions and ill timed post. I'm just really realizing it know that my time here is over.

Now before anyone asks, no I am not sure that she has the same feelings for me as I have for her, but I wouldn't bet against it.