Here is the story:

I’m leaving the job and country I’m currently in 5 weeks form now.
A week ago, I asked out this girl at work. Thing is, she works in HR, and knew who I was as “the guy leaving in 6 weeks” before knowing me at all (as part of her job).
Is this bad? Might she think I’m willing to stay back for a while? (I’m not, my life is moving on in the direction I’ve been planning for the past 2 years). How do I check? How do I be honest without hurting her?
I’ll provide more details as needed, not sure what to provide.